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Nothing, the complete absence of anything, has been a matter of philosophical debate since at least the 5th century BC. Early Greek philosophers argued that it was impossible for ''nothing'' to exist. The
atomists Atomism (from Greek , ''atomon'', i.e. "uncuttable, indivisible") is a natural philosophy proposing that the physical universe is composed of fundamental indivisible components known as atoms. References to the concept of atomism and its atoms a ...
allowed ''nothing'' but only in the spaces between the invisibly small atoms. For them, all space was filled with atoms.
Aristotle Aristotle (; grc-gre, Ἀριστοτέλης ''Aristotélēs'', ; 384–322 BC) was a Greek philosopher and polymath during the Classical period in Ancient Greece. Taught by Plato, he was the founder of the Peripatetic school of phil ...
took the view that there exists
matter In classical physics and general chemistry, matter is any substance that has mass and takes up space by having volume. All everyday objects that can be touched are ultimately composed of atoms, which are made up of interacting subatomic partic ...
and there exists
space Space is the boundless three-dimensional extent in which objects and events have relative position and direction. In classical physics, physical space is often conceived in three linear dimensions, although modern physicists usually consider ...
, a receptacle into which matter objects can be placed. This became the paradigm for classical scientists of the modern age like
Newton Newton most commonly refers to: * Isaac Newton (1642–1726/1727), English scientist * Newton (unit), SI unit of force named after Isaac Newton Newton may also refer to: Arts and entertainment * ''Newton'' (film), a 2017 Indian film * Newton ( ...
. Nevertheless, some philosophers, like Descartes, continued to argue against the existence of empty space until the scientific discovery of a physical
vacuum A vacuum is a space devoid of matter. The word is derived from the Latin adjective ''vacuus'' for "vacant" or "void". An approximation to such vacuum is a region with a gaseous pressure much less than atmospheric pressure. Physicists often dis ...
.
Existentialists Existentialism ( ) is a form of philosophical inquiry that explores the problem of human existence and centers on human thinking, feeling, and acting. Existentialist thinkers frequently explore issues related to the meaning, purpose, and value ...
like
Sartre Jean-Paul Charles Aymard Sartre (, ; ; 21 June 1905 – 15 April 1980) was one of the key figures in the philosophy of existentialism (and phenomenology), a French playwright, novelist, screenwriter, political activist, biographer, and litera ...
and
Heidegger Martin Heidegger (; ; 26 September 188926 May 1976) was a German philosopher who is best known for contributions to phenomenology, hermeneutics, and existentialism. He is among the most important and influential philosophers of the 20th centur ...
(as interpreted by Sartre) have associated ''nothing'' with consciousness. Some writers have made connections between Heidegger's concept of ''nothing'' and the
nirvana ( , , ; sa, निर्वाण} ''nirvāṇa'' ; Pali: ''nibbāna''; Prakrit: ''ṇivvāṇa''; literally, "blown out", as in an oil lampRichard Gombrich, ''Theravada Buddhism: A Social History from Ancient Benāres to Modern Colombo.' ...
of Eastern religions. Modern science does not equate ''vacuum'' with ''nothing''. Indeed, the vacuum in
quantum field theory In theoretical physics, quantum field theory (QFT) is a theoretical framework that combines classical field theory, special relativity, and quantum mechanics. QFT is used in particle physics to construct physical models of subatomic particles and ...
is filled with
virtual particle A virtual particle is a theoretical transient particle that exhibits some of the characteristics of an ordinary particle, while having its existence limited by the uncertainty principle. The concept of virtual particles arises in the perturbat ...
s. The quantum vacuum is often viewed as a modern version of an aether theory.


Philosophy


Western philosophy

Some would consider the study of "nothing" to be foolish. A typical response of this type is voiced by
Giacomo Casanova Giacomo Girolamo Casanova (, ; 2 April 1725 – 4 June 1798) was an Italian adventurer and author from the Republic of Venice. His autobiography, (''Story of My Life''), is regarded as one of the most authentic sources of information about the c ...
(1725–1798) in conversation with his landlord, one Dr. Gozzi, who also happens to be a priest: However, "nothingness" has been treated as a serious subject for a very long time. In philosophy, to avoid linguistic traps over the meaning of "nothing", a phrase such as ''not-being'' is often employed to make clear what is being discussed.


Parmenides

One of the earliest Western philosophers to consider nothing as a concept was
Parmenides Parmenides of Elea (; grc-gre, Παρμενίδης ὁ Ἐλεάτης; ) was a pre-Socratic Greek philosopher from Elea in Magna Graecia. Parmenides was born in the Greek colony of Elea, from a wealthy and illustrious family. His dates a ...
(5th century BC), who was a Greek philosopher of the
monist Monism attributes oneness or singleness (Greek: μόνος) to a concept e.g., existence. Various kinds of monism can be distinguished: * Priority monism states that all existing things go back to a source that is distinct from them; e.g., i ...
school. He argued that "nothing" cannot exist by the following line of reasoning: To speak of a thing, one has to speak of a thing that exists. Since we can speak of a thing in the past, this thing must still exist (in some sense) now, and from this he concludes that there is no such thing as change. As a corollary, there can be no such things as ''coming-into-being'', ''passing-out-of-being'', or ''not-being''. Parmenides was taken seriously by other philosophers, influencing, for instance,
Socrates Socrates (; ; –399 BC) was a Greek philosopher from Athens who is credited as the founder of Western philosophy and among the first moral philosophers of the ethical tradition of thought. An enigmatic figure, Socrates authored no te ...
and
Plato Plato ( ; grc-gre, Πλάτων ; 428/427 or 424/423 – 348/347 BC) was a Greek philosopher born in Athens during the Classical period in Ancient Greece. He founded the Platonist school of thought and the Academy, the first institution ...
. Aristotle gives Parmenides serious consideration but concludes, "Although these opinions seem to follow logically in a dialectical discussion, yet to believe them seems next door to madness when one considers the facts." In modern times,
Albert Einstein Albert Einstein ( ; ; 14 March 1879 – 18 April 1955) was a German-born theoretical physicist, widely acknowledged to be one of the greatest and most influential physicists of all time. Einstein is best known for developing the theory ...
's concept of
spacetime In physics, spacetime is a mathematical model that combines the three dimensions of space and one dimension of time into a single four-dimensional manifold. Spacetime diagrams can be used to visualize relativistic effects, such as why differen ...
has led many scientists, including Einstein himself, to adopt a position remarkably similar to Parmenides. On the death of his friend
Michele Besso Michele Angelo Besso (Riesbach, 25 May 1873 – Geneva, 15 March 1955) was a Swiss-Italian engineer best known for working closely with Albert Einstein. Biography Besso was born in Riesbach from a family of Italian Jewish (Sephardi) descent. H ...
, Einstein consoled his widow with the words, "Now he has departed from this strange world a little ahead of me. That signifies nothing. For those of us that believe in physics, the distinction between past, present and future is only a stubbornly persistent illusion."


Leucippus

Leucippus Leucippus (; el, Λεύκιππος, ''Leúkippos''; fl. 5th century BCE) is a pre-Socratic Greek philosopher who has been credited as the first philosopher to develop a theory of atomism. Leucippus' reputation, even in antiquity, was obscured ...
(early 5th century BC), one of the
atomists Atomism (from Greek , ''atomon'', i.e. "uncuttable, indivisible") is a natural philosophy proposing that the physical universe is composed of fundamental indivisible components known as atoms. References to the concept of atomism and its atoms a ...
, along with other philosophers of his time, made attempts to reconcile this monism with the everyday observation of motion and change. He accepted the
monist Monism attributes oneness or singleness (Greek: μόνος) to a concept e.g., existence. Various kinds of monism can be distinguished: * Priority monism states that all existing things go back to a source that is distinct from them; e.g., i ...
position that there could be no motion without a void. The void is the opposite of being. It is ''not-being''. On the other hand, there exists
something Something may refer to: Philosophy and language *Something (concept) *Something, an English indefinite pronoun Music Albums * ''Something'' (Chairlift album), 2012 * ''Something'' (Shirley Bassey album), 1970 * ''Something'' (Shirley Scott ...
known as an absolute
plenum Plenum may refer to: * Plenum chamber, a chamber intended to contain air, gas, or liquid at positive pressure * Plenism, or ''Horror vacui'' (physics) the concept that "nature abhors a vacuum" * Plenum (meeting), a meeting of a deliberative asse ...
, a space filled with matter, and there can be no motion in a plenum because it is completely full. But, there is not just one monolithic plenum, for existence consists of a multiplicity of plenums. These are the invisibly small "atoms" of Greek atomist theory, later expanded by
Democritus Democritus (; el, Δημόκριτος, ''Dēmókritos'', meaning "chosen of the people"; – ) was an Ancient Greek pre-Socratic philosopher from Abdera, primarily remembered today for his formulation of an atomic theory of the universe. No ...
(c. 460–370 BC), which allows the void to "exist" between them. In this scenario, macroscopic objects can ''come-into-being'', move through space, and pass into ''not-being'' by means of the coming together and moving apart of their constituent atoms. The void must exist to allow this to happen, or else the "frozen world" of Parmenides must be accepted.
Bertrand Russell Bertrand Arthur William Russell, 3rd Earl Russell, (18 May 1872 – 2 February 1970) was a British mathematician, philosopher, logician, and public intellectual. He had a considerable influence on mathematics, logic, set theory, linguistics, ...
points out that this does not exactly defeat the argument of Parmenides but, rather, ignores it by taking the rather modern scientific position of starting with the observed data (motion, etc.) and constructing a theory based on the data, as opposed to Parmenides' attempts to work from pure logic. Russell also observes that both sides were mistaken in believing that there can be no motion in a plenum, but arguably motion cannot ''start'' in a plenum. Cyril Bailey notes that Leucippus is the first to say that a "thing" (the void) might be real without being a body and points out the irony that this comes from a materialistic atomist. Leucippus is therefore the first to say that "nothing" has a reality attached to it.


Aristotle, Newton, Descartes

Aristotle Aristotle (; grc-gre, Ἀριστοτέλης ''Aristotélēs'', ; 384–322 BC) was a Greek philosopher and polymath during the Classical period in Ancient Greece. Taught by Plato, he was the founder of the Peripatetic school of phil ...
(384–322 BC) provided the classic escape from the logical problem posed by Parmenides by distinguishing things that are ''matter'' and things that are ''space''. In this scenario, space is not "nothing" but, rather, a receptacle in which objects of matter can be placed. The true void (as "nothing") is different from "space" and is removed from consideration. This characterization of space reached its pinnacle with
Isaac Newton Sir Isaac Newton (25 December 1642 – 20 March 1726/27) was an English mathematician, physicist, astronomer, alchemist, theologian, and author (described in his time as a "natural philosopher"), widely recognised as one of the grea ...
who asserted the existence of absolute space.
René Descartes René Descartes ( or ; ; Latinized: Renatus Cartesius; 31 March 1596 – 11 February 1650) was a French philosopher, scientist, and mathematician, widely considered a seminal figure in the emergence of modern philosophy and science. Mathem ...
, on the other hand, returned to a Parmenides-like argument of denying the existence of space. For Descartes, there was matter, and there was extension of matter leaving no room for the existence of "nothing". The idea that space can actually be empty was generally still not accepted by philosophers who invoked arguments similar to the plenum reasoning. Although Descartes views on this were challenged by
Blaise Pascal Blaise Pascal ( , , ; ; 19 June 1623 – 19 August 1662) was a French mathematician, physicist, inventor, philosopher, and Catholic Church, Catholic writer. He was a child prodigy who was educated by his father, a tax collector in Rouen. Pa ...
, he declined to overturn the traditional belief, '' horror vacui'', commonly stated as "nature abhors a vacuum". This remained so until
Evangelista Torricelli Evangelista Torricelli ( , also , ; 15 October 160825 October 1647) was an Italian physicist and mathematician, and a student of Galileo. He is best known for his invention of the barometer, but is also known for his advances in optics and work o ...
invented the
barometer A barometer is a scientific instrument that is used to measure air pressure in a certain environment. Pressure tendency can forecast short term changes in the weather. Many measurements of air pressure are used within surface weather analysis ...
in 1643 and showed that an empty space appeared if the mercury tube was turned upside down. This phenomenon being known as the Torricelli vacuum and the unit of vacuum pressure, the
torr The torr (symbol: Torr) is a unit of pressure based on an absolute scale, defined as exactly of a standard atmosphere (). Thus one torr is exactly (≈ ). Historically, one torr was intended to be the same as one "millimeter of mercury ...
, being named after him. Even Torricelli's teacher, the famous
Galileo Galilei Galileo di Vincenzo Bonaiuti de' Galilei (15 February 1564 – 8 January 1642) was an Italian astronomer, physicist and engineer, sometimes described as a polymath. Commonly referred to as Galileo, his name was pronounced (, ). He was ...
had previously been unable to adequately explain the sucking action of a pump.


John the Scot

John the Scot, or
Johannes Scotus Eriugena John Scotus Eriugena, also known as Johannes Scotus Erigena, John the Scot, or John the Irish-born ( – c. 877) was an Irish people, Irish Neoplatonism, Neoplatonist Philosophy, philosopher, Theology, theologian and poet of the Early M ...
(c. 815–877) held many surprisingly heretical beliefs for the time he lived in for which no action appears ever to have been taken against him. His ideas mostly stem from, or are based on his work of translating
pseudo-Dionysius Pseudo-Dionysius the Areopagite (or Dionysius the Pseudo-Areopagite) was a Greek author, Christian theologian and Neoplatonic philosopher of the late 5th to early 6th century, who wrote a set of works known as the ''Corpus Areopagiticum'' o ...
. His beliefs are essentially
pantheist Pantheism is the belief that reality, the universe and the cosmos are identical with divinity and a supreme supernatural being or entity, pointing to the universe as being an immanent creator deity still expanding and creating, which has e ...
and he classifies evil, amongst many other things, into ''not-being''. This is done on the grounds that evil is the opposite of good, a quality of God, but God can have no opposite, since God is everything in the pantheist view of the world. Similarly, the idea that God created the world out of "nothing" is to be interpreted as meaning that the "nothing" here is synonymous with God.


G. W. F. Hegel

Georg Wilhelm Friedrich Hegel Georg Wilhelm Friedrich Hegel (; ; 27 August 1770 – 14 November 1831) was a German philosopher. He is one of the most important figures in German idealism and one of the founding figures of modern Western philosophy. His influence extends ...
(1770–1831) is the philosopher who brought the
dialectic Dialectic ( grc-gre, διαλεκτική, ''dialektikḗ''; related to dialogue; german: Dialektik), also known as the dialectical method, is a discourse between two or more people holding different points of view about a subject but wishing ...
al method to a new pinnacle of development. According to Hegel in ''
Science of Logic ''Science of Logic'' (''SL''; german: Wissenschaft der Logik, ''WdL''), first published between 1812 and 1816, is the work in which Georg Wilhelm Friedrich Hegel outlined his vision of logic. Hegel's logic is a system of '' dialectics'', i.e., ...
'', the dialectical methods consists of three steps. First, a thesis is given, which can be any
proposition In logic and linguistics, a proposition is the meaning of a declarative sentence. In philosophy, " meaning" is understood to be a non-linguistic entity which is shared by all sentences with the same meaning. Equivalently, a proposition is the no ...
in
logic Logic is the study of correct reasoning. It includes both formal and informal logic. Formal logic is the science of deductively valid inferences or of logical truths. It is a formal science investigating how conclusions follow from premises ...
. Second, the antithesis of the thesis is formed and, finally, a synthesis incorporating both thesis and antithesis. Hegel believed that no proposition taken by itself can be completely true. Only the whole can be true, and the dialectical synthesis was the means by which the whole could be examined in relation to a specific proposition. Truth consists of the whole process. Separating out thesis, antithesis, or synthesis as a stand-alone statement results in something that is in some way or other untrue. The concept of "nothing" arises in Hegel right at the beginning of his ''Logic''. The whole is called by Hegel the "Absolute" and is to be viewed as something spiritual. Hegel then has: *
Thesis A thesis ( : theses), or dissertation (abbreviated diss.), is a document submitted in support of candidature for an academic degree or professional qualification presenting the author's research and findings.International Standard ISO 7144: ...
: the absolute is pure being *
Antithesis Antithesis (Greek for "setting opposite", from "against" and "placing") is used in writing or speech either as a proposition that contrasts with or reverses some previously mentioned proposition, or when two opposites are introduced together f ...
: the absolute is nothing *
Synthesis Synthesis or synthesize may refer to: Science Chemistry and biochemistry *Chemical synthesis, the execution of chemical reactions to form a more complex molecule from chemical precursors ** Organic synthesis, the chemical synthesis of organ ...
: the absolute is becoming


Existentialists

The most prominent figure among the
existentialists Existentialism ( ) is a form of philosophical inquiry that explores the problem of human existence and centers on human thinking, feeling, and acting. Existentialist thinkers frequently explore issues related to the meaning, purpose, and value ...
is
Jean-Paul Sartre Jean-Paul Charles Aymard Sartre (, ; ; 21 June 1905 – 15 April 1980) was one of the key figures in the philosophy of existentialism (and phenomenology), a French playwright, novelist, screenwriter, political activist, biographer, and litera ...
, whose ideas in his book ''
Being and Nothingness ''Being and Nothingness: An Essay on Phenomenological Ontology'' (french: L'Être et le néant : Essai d'ontologie phénoménologique), sometimes published with the subtitle ''A Phenomenological Essay on Ontology'', is a 1943 book by the philosoph ...
'' (''L'être et le néant'') are heavily influenced by ''
Being and Time ''Being and Time'' (german: Sein und Zeit) is the 1927 '' magnum opus'' of German philosopher Martin Heidegger and a key document of existentialism. ''Being and Time'' had a notable impact on subsequent philosophy, literary theory and many oth ...
'' (''Sein und Zeit'') of
Martin Heidegger Martin Heidegger (; ; 26 September 188926 May 1976) was a German philosopher who is best known for contributions to phenomenology, hermeneutics, and existentialism. He is among the most important and influential philosophers of the 20th centur ...
, although Heidegger later stated that he was misunderstood by Sartre. Sartre defines two kinds of "being" (être). One kind is ''être-en-soi'', the brute existence of things such as a tree. The other kind is ''être-pour-soi'' which is consciousness. Sartre claims that this second kind of being is "nothing" since consciousness cannot be an object of consciousness and can possess no essence. Sartre, and even more so,
Jaques Lacan Jacques Marie Émile Lacan (, , ; 13 April 1901 – 9 September 1981) was a French psychoanalyst and psychiatrist. Described as "the most controversial psycho-analyst since Freud", Lacan gave yearly seminars in Paris from 1953 to 1981, and pu ...
, use this conception of nothing as the foundation of their atheist philosophy. Equating nothingness with being leads to creation from nothing and hence God is no longer needed for there to be existence.


Eastern philosophy

The understanding of "nothing" varies widely between cultures, especially between Western and Eastern cultures and philosophical traditions. For instance, ''
Śūnyatā ''Śūnyatā'' ( sa, wikt:शून्यता#Sanskrit, शून्यता, śūnyatā; pi, suññatā) pronounced in English as (shoon-ya-ta), translated most often as ''emptiness'', ''vacuity'', and sometimes ''voidness'', is a Buddh ...
'' (emptiness), unlike "nothingness", is considered to be a state of mind in some forms of
Buddhism Buddhism ( , ), also known as Buddha Dharma and Dharmavinaya (), is an Indian religion or philosophical tradition based on teachings attributed to the Buddha. It originated in northern India as a -movement in the 5th century BCE, and gra ...
(see
Nirvana ( , , ; sa, निर्वाण} ''nirvāṇa'' ; Pali: ''nibbāna''; Prakrit: ''ṇivvāṇa''; literally, "blown out", as in an oil lampRichard Gombrich, ''Theravada Buddhism: A Social History from Ancient Benāres to Modern Colombo.' ...
, mu, and
Bodhi The English term enlightenment is the Western translation of various Buddhist terms, most notably bodhi and vimutti. The abstract noun ''bodhi'' (; Sanskrit: बोधि; Pali: ''bodhi''), means the knowledge or wisdom, or awakened intellect ...
). Achieving "nothing" as a state of mind in this tradition allows one to be totally focused on a thought or activity at a level of intensity that they would not be able to achieve if they were consciously thinking. A classic example of this is an archer attempting to erase the mind and clear the thoughts to better focus on the shot. Some authors have pointed to similarities between the Buddhist conception of nothingness and the ideas of Martin Heidegger and existentialists like Sartre, although this connection has not been explicitly made by the philosophers themselves. In some
Eastern philosophies Eastern philosophy or Asian philosophy includes the various philosophies that originated in East and South Asia, including Chinese philosophy, Japanese philosophy, Korean philosophy, and Vietnamese philosophy; which are dominant in East Asia, ...
, the concept of "nothingness" is characterized by an egoless state of being in which one fully realizes one's own small part in the cosmos. The
Kyoto School The is the name given to the Japanese philosophical movement centered at Kyoto University that assimilated Western philosophy and religious ideas and used them to reformulate religious and moral insights unique to the East Asian cultural tradit ...
handles the concept of nothingness as well.


Science

Despite the proven existence of vacuum, scientists through the 17th to 19th centuries thought there must be a medium pervading all space that allowed the transmission of light or gravity. Thus, in this period, it was not accepted that complete ''nothing'' was possible. Theories describing such a medium are collectively known as
aether theories In physics, aether theories (also known as ether theories) propose the existence of a medium, a space-filling substance or field as a transmission medium for the propagation of electromagnetic or gravitational forces. Since the development of spe ...
, so named as an evocation of the aether, the classical element from Greek philosophy. In particular, the medium that is supposed to allow the transmission of light is called the
luminiferous aether Luminiferous aether or ether ("luminiferous", meaning "light-bearing") was the postulated medium for the propagation of light. It was invoked to explain the ability of the apparently wave-based light to propagate through empty space (a vacuum), so ...
. This became the centre of attention after
James Clerk Maxwell James Clerk Maxwell (13 June 1831 – 5 November 1879) was a Scottish mathematician and scientist responsible for the classical theory of electromagnetic radiation, which was the first theory to describe electricity, magnetism and ligh ...
proposed that light was an
electromagnetic wave In physics, electromagnetic radiation (EMR) consists of waves of the electromagnetic (EM) field, which propagate through space and carry momentum and electromagnetic radiant energy. It includes radio waves, microwaves, infrared, (visib ...
in 1865. Early aether theories include those of
Robert Hooke Robert Hooke FRS (; 18 July 16353 March 1703) was an English polymath active as a scientist, natural philosopher and architect, who is credited to be one of two scientists to discover microorganisms in 1665 using a compound microscope that ...
(1665) and
Christiaan Huygens Christiaan Huygens, Lord of Zeelhem, ( , , ; also spelled Huyghens; la, Hugenius; 14 April 1629 – 8 July 1695) was a Dutch mathematician, physicist, engineer, astronomer, and inventor, who is regarded as one of the greatest scientists of ...
(1690). Newton also had an aether theory, but to Newton, it was not the medium of transmission since he theorised light was composed of "corpuscles" which moved by simple mechanical motion. He needed the aether instead to explain
refraction In physics, refraction is the redirection of a wave as it passes from one medium to another. The redirection can be caused by the wave's change in speed or by a change in the medium. Refraction of light is the most commonly observed phenomeno ...
. Early theories generally proposed a mechanical medium of some sort, allowing the possibility of the same medium supporting both light and gravity. Proof that light has a wave nature, rather than Newton's corpuscles, was provided by Thomas Young in his 1803 interference experiment, seemingly confirming the need for an aether. The most well known attempt to detect the existence of the aether was conducted by
Albert A. Michelson Albert Abraham Michelson Royal Society of London, FFRS HFRSE (surname pronunciation anglicized as "Michael-son", December 19, 1852 – May 9, 1931) was a German-born American physicist of Polish/Jewish origin, known for his work on measuring the ...
in an experiment of 1881, later repeated with Edward W. Morley in 1887 with more precision. This failed to show the desired effect, but reluctant to abandon the aether theory, various attempts where made to modify it to account for the Michelson-Morley result. Finally,
Albert Einstein Albert Einstein ( ; ; 14 March 1879 – 18 April 1955) was a German-born theoretical physicist, widely acknowledged to be one of the greatest and most influential physicists of all time. Einstein is best known for developing the theory ...
, building on the work of
Hendrik Lorentz Hendrik Antoon Lorentz (; 18 July 1853 – 4 February 1928) was a Dutch physicist who shared the 1902 Nobel Prize in Physics with Pieter Zeeman for the discovery and theoretical explanation of the Zeeman effect. He also derived the Lorentz t ...
, published his theory of
special relativity In physics, the special theory of relativity, or special relativity for short, is a scientific theory regarding the relationship between space and time. In Albert Einstein's original treatment, the theory is based on two postulates: # The laws o ...
in 1905 which dispenses entirely with the need for a luminiferous aether to explain the transmission of light. Although a physical medium was no longer required, the concept of aether still did not entirely vanish. It remained necessary to assign properties to the vacuum for various purposes. In some respects ''vacuum'' and ''aether'' are treated as synonyms by science. In modern
quantum field theory In theoretical physics, quantum field theory (QFT) is a theoretical framework that combines classical field theory, special relativity, and quantum mechanics. QFT is used in particle physics to construct physical models of subatomic particles and ...
, a completely empty vacuum is not at
zero-point energy Zero-point energy (ZPE) is the lowest possible energy that a quantum mechanical system may have. Unlike in classical mechanics, quantum systems constantly Quantum fluctuation, fluctuate in their lowest energy state as described by the Heisen ...
, the lowest possible energy state. First proposed by
Paul Dirac Paul Adrien Maurice Dirac (; 8 August 1902 – 20 October 1984) was an English theoretical physicist who is regarded as one of the most significant physicists of the 20th century. He was the Lucasian Professor of Mathematics at the Univer ...
in 1927, the lowest energy state has constant random
vacuum fluctuations In quantum physics, a quantum fluctuation (also known as a vacuum state fluctuation or vacuum fluctuation) is the temporary random change in the amount of energy in a point in space, as prescribed by Werner Heisenberg's uncertainty principle. ...
which bring into existence short-lived
virtual particle A virtual particle is a theoretical transient particle that exhibits some of the characteristics of an ordinary particle, while having its existence limited by the uncertainty principle. The concept of virtual particles arises in the perturbat ...
s. This is somewhat reminiscent of early philosophical plenum ideas, and means that ''vacuum'' and ''nothing'' are certainly not synonyms.Milonni, p. 35


See also

*
A Universe from Nothing ''A Universe from Nothing: Why There Is Something Rather than Nothing'' is a non-fiction book by the physicist Lawrence M. Krauss, initially published on January 10, 2012 by Free Press. It discusses modern cosmogony and its implications for the ...
*
Absolute zero Absolute zero is the lowest limit of the thermodynamic temperature scale, a state at which the enthalpy and entropy of a cooled ideal gas reach their minimum value, taken as zero kelvin. The fundamental particles of nature have minimum vibration ...
*
Action at a distance In physics, action at a distance is the concept that an object can be affected without being physically touched (as in mechanical contact) by another object. That is, it is the non-local interaction of objects that are separated in space. Non-c ...
* Big Bounce *
Cosmogony Cosmogony is any model concerning the origin of the cosmos or the universe. Overview Scientific theories In astronomy, cosmogony refers to the study of the origin of particular astrophysical objects or systems, and is most commonly used i ...
*
Dark matter Dark matter is a hypothetical form of matter thought to account for approximately 85% of the matter in the universe. Dark matter is called "dark" because it does not appear to interact with the electromagnetic field, which means it does not ab ...
*
Empty (disambiguation) Empty may refer to: ‍ Music Albums * ''Empty'' (God Lives Underwater album) or the title song, 1995 * ''Empty'' (Nils Frahm album), 2020 * ''Empty'' (Tait album) or the title song, 2001 Songs * "Empty" (The Click Five song), 2007 * ...
*
Empty set In mathematics, the empty set is the unique set having no elements; its size or cardinality (count of elements in a set) is zero. Some axiomatic set theories ensure that the empty set exists by including an axiom of empty set, while in other ...
*
Eternal inflation Eternal inflation is a hypothetical inflationary universe model, which is itself an outgrowth or extension of the Big Bang theory. According to eternal inflation, the inflationary phase of the universe's expansion lasts forever throughout most of ...
*
Everything Everything, every-thing, or every thing is all that exists; the opposite of nothing, or its complement. It is the totality of things relevant to some subject matter. Without expressed or implied limits, it may refer to anything. The univers ...
*
Ex nihilo (Latin for "creation out of nothing") is the doctrine that matter is not eternal but had to be created by some divine creative act. It is a theistic answer to the question of how the universe comes to exist. It is in contrast to ''Ex nihilo ni ...
*
False vacuum In quantum field theory, a false vacuum is a hypothetical vacuum that is relatively stable, but not in the most stable state possible. This condition is known as metastable. It may last for a very long time in that state, but could eventually d ...
* Meontology *
Meaning of life The meaning of life, or the answer to the question: "What is the meaning of life?", pertains to the significance of living or existence in general. Many other related questions include: "Why are we here?", "What is life all about?", or "What ...
*
Mu (negative) The Japanese and Korean term ' () or Chinese (), meaning "not have; without", is a key word in Buddhism, especially Zen traditions. Etymology The Old Chinese * () is cognate with the Proto-Tibeto-Burman *''ma'', meaning "not". This reconstru ...
*
Negation (linguistics) In linguistics and grammar, affirmation (abbreviated ) and negation () are ways in which grammar encodes positive and negative polarity into verb phrases, clauses, or other utterances. An affirmative (positive) form is used to express the validi ...
*
Negative theology Apophatic theology, also known as negative theology, is a form of theological thinking and religious practice which attempts to approach God, the Divine, by negation, to speak only in terms of what may not be said about the perfect goodness th ...
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Nihilism Nihilism (; ) is a philosophy, or family of views within philosophy, that rejects generally accepted or fundamental aspects of human existence, such as objective truth, knowledge, morality, values, or meaning. The term was popularized by Ivan ...
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Nobody (disambiguation) Nobody may refer to: * Nobody, an indefinite pronoun Nobody may also refer to: Fictional characters * Nobody (''Kingdom Hearts''), a race of beings in the ''Kingdom Hearts'' video game series *Nobody, a character in the Jim Jarmusch films ''De ...
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Nothing comes from nothing Nothing comes from nothing ( gr, οὐδὲν ἐξ οὐδενός; la, ex nihilo nihil fit) is a philosophical dictum first argued by Parmenides. It is associated with ancient Greek cosmology, such as is presented not just in the works of Homer ...
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Quantum vacuum fluctuations In quantum physics, a quantum fluctuation (also known as a vacuum state fluctuation or vacuum fluctuation) is the temporary random change in the amount of energy in a point in space, as prescribed by Werner Heisenberg's uncertainty principle. ...
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Ultimate fate of the universe The ultimate fate of the universe is a topic in physical cosmology, whose theoretical restrictions allow possible scenarios for the evolution and ultimate fate of the universe to be described and evaluated. Based on available observational ev ...
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Vacuum A vacuum is a space devoid of matter. The word is derived from the Latin adjective ''vacuus'' for "vacant" or "void". An approximation to such vacuum is a region with a gaseous pressure much less than atmospheric pressure. Physicists often dis ...
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Vanitas A ''vanitas'' (Latin for 'vanity') is a symbolic work of art showing the transience of life, the futility of pleasure, and the certainty of death, often contrasting symbols of wealth and symbols of ephemerality and death. Best-known are ''van ...
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Vacuous truth In mathematics and logic, a vacuous truth is a conditional or universal statement (a universal statement that can be converted to a conditional statement) that is true because the antecedent cannot be satisfied. For example, the statement "she ...
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Void (disambiguation) Void may refer to: Science, engineering, and technology * Void (astronomy), the spaces between galaxy filaments that contain no galaxies * Void (composites), a pore that remains unoccupied in a composite material * Void, synonym for vacuum, a ...
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Zero 0 (zero) is a number representing an empty quantity. In place-value notation Positional notation (or place-value notation, or positional numeral system) usually denotes the extension to any base of the Hindu–Arabic numeral system (or ...


Notes


References

* Hsu, Jong-Ping, ''Einstein's Relativity and Beyond: New Symmetry Approaches'', World Scientific, 2000 . * Milonni, Peter W., ''The Quantum Vacuum: An Introduction to Quantum Electrodynamics'', Academic Press, 2013 . * Pieper, Josef; Wald, Berthold, ''For the Love of Wisdom: Essays on the Nature of Philosophy'', Translator: Roger Wasserman, Ignatius Press, 2006 . * Russell, Bertrand. ''History of Western Philosophy'', Routledge, 1995 . * Schaffner, Kenneth F., ''Nineteenth-Century Aether Theories'', Elsevier, 2016 . * Whittaker, Edmund Taylor, ''A History of the Theories of Aether and Electricity from the age of Descrates to the Close of the Ninenteenth Century'', London: Longmans Green & Co, 1910 .


Further reading

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External links

* * {{Authority control Existentialist concepts Perception Ontology Concepts in metaphysics