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Anaximenes of Miletus (; grc-gre, Ἀναξιμένης ὁ Μιλήσιος, translit=Anaximenēs ho Milēsios; ) was an
Ancient Greek Ancient Greek includes the forms of the Greek language used in ancient Greece and the ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek (), Dark Ages (), the Archaic peri ...
, Ionian
Pre-Socratic Pre-Socratic philosophy, also known as early Greek philosophy, is ancient Greek philosophy before Socrates. Pre-Socratic philosophers were mostly interested in cosmology, the beginning and the substance of the universe, but the inquiries of thes ...
philosopher A philosopher is a person who practices or investigates philosophy. The term ''philosopher'' comes from the grc, φιλόσοφος, , translit=philosophos, meaning 'lover of wisdom'. The coining of the term has been attributed to the Greek th ...
from
Miletus Miletus (; gr, Μῑ́λητος, Mī́lētos; Hittite transcription ''Millawanda'' or ''Milawata'' (exonyms); la, Mīlētus; tr, Milet) was an ancient Greek city on the western coast of Anatolia, near the mouth of the Maeander River in a ...
in Asia Minor (modern-day Turkey), active in the latter half of the 6th century BC. The details of his life are obscure because none of his work has been preserved. Anaximenes' ideas are only known today because of comments about him made by later writers, such as
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 ...
. As the last of the three philosophers of the
Milesian School The Ionian school of Pre-Socratic philosophy was centred in Miletus, Ionia in the 6th century BC. Miletus and its environment was a thriving mercantile melting pot of current ideas of the time. The Ionian School included such thinkers as Thales, ...
, considered the first philosophers of the Western world, Anaximenes is best known and identified as a younger friend or student of Anaximander, who was himself taught by the first philosopher
Thales Thales of Miletus ( ; grc-gre, Θαλῆς; ) was a Greek mathematician, astronomer, statesman, and pre-Socratic philosopher from Miletus in Ionia, Asia Minor. He was one of the Seven Sages of Greece. Many, most notably Aristotle, regarded him ...
. Each developed a distinct cosmology without completely rejecting their predecessors views. Each were material monists who sought to discover the ''
arche ''Arche'' (; grc, ἀρχή; sometimes also transcribed as ''arkhé'') is a Greek word with primary senses "beginning", "origin" or "source of action" (: from the beginning, οr : the original argument), and later "first principle" or "element". ...
;'' the one, underlying physical yet divine basis of everything. Thales proposed all was made of water; Anaximander proposed all was made of ''apeiron'' or something indefinite rather than something specific, and Anaximenes proposed all was made of
air The atmosphere of Earth is the layer of gases, known collectively as air, retained by Earth's gravity that surrounds the planet and forms its planetary atmosphere. The atmosphere of Earth protects life on Earth by creating pressure allowing f ...
, or literally ''aer'' which may also include mist or vapor. More condensed air made for colder, denser objects and more
rarefied Rarefaction is the reduction of an item's density, the opposite of compression. Like compression, which can travel in waves (sound waves, for instance), rarefaction waves also exist in nature. A common rarefaction wave is the area of low relati ...
air made for hotter, lighter objects. Much of his astronomical thought was based on Anaximander's, though he altered Anaximander's astrological ideas to better fit his own philosophical views on physics and the natural world. Anaximenes believed the Earth was flat like a disc and rode on air like a frisbee. The Anaximenes crater on the
Moon The Moon is Earth's only natural satellite. It is the fifth largest satellite in the Solar System and the largest and most massive relative to its parent planet, with a diameter about one-quarter that of Earth (comparable to the width of ...
is named in his honor. Some of Anaximenes' writings are referenced during the
Hellenistic Age In Classical antiquity, the Hellenistic period covers the time in Mediterranean history after Classical Greece, between the death of Alexander the Great in 323 BC and the emergence of the Roman Empire, as signified by the Battle of Actium in 31 ...
, but no record of these documents currently exist.
Apollodorus of Damascus Apollodorus of Damascus ( grc, Ἀπολλόδωρος ὁ Δαμασκηνός) was a Nabataean architect and engineer from Damascus, Roman Syria, who flourished during the 2nd century AD. As an engineer he authored several technical treatises, ...
estimated Anaximenes' lifespan as having
flourished ''Floruit'' (; abbreviated fl. or occasionally flor.; from Latin for "they flourished") denotes a date or period during which a person was known to have been alive or active. In English, the unabbreviated word may also be used as a noun indicatin ...
during the same time period in which
Cyrus the Great Cyrus II of Persia (; peo, 𐎤𐎢𐎽𐎢𐏁 ), commonly known as Cyrus the Great, was the founder of the Achaemenid Empire, the first Persian empire. Schmitt Achaemenid dynasty (i. The clan and dynasty) Under his rule, the empire embraced ...
defeated
Croesus Croesus ( ; Lydian: ; Phrygian: ; grc, Κροισος, Kroisos; Latin: ; reigned: c. 585 – c. 546 BC) was the king of Lydia, who reigned from 585 BC until his defeat by the Persian king Cyrus the Great in 547 or 546 BC. Croesus was ...
at the
Battle of Thymbra The Battle of Thymbra was the decisive battle in the war between Croesus of the Lydian Kingdom and Cyrus the Great of the Achaemenid Empire. Cyrus, after he had pursued Croesus into Lydia after the drawn Battle of Pteria, met the remains of ...
in 546 BC. Philosophy may have spread elsewhere because Miletus was captured by the
Persian army The military history of Iran has been relatively well-documented, with thousands of years' worth of recorded history. Largely credited to its historically unchanged geographical and geopolitical condition, the modern-day Islamic Republic of I ...
in 494 BC.


Air as the Arche

Anaximenes thought air was the primary substance that held the universe together. He believed that air was infinite and divine. He was the first to use the word ''
pneuma ''Pneuma'' () is an ancient Greek word for "breath", and in a religious context for " spirit" or "soul". It has various technical meanings for medical writers and philosophers of classical antiquity, particularly in regard to physiology, and is ...
'' (“
breath Breathing (or ventilation) is the process of moving air into and from the lungs to facilitate gas exchange with the internal environment, mostly to flush out carbon dioxide and bring in oxygen. All aerobic creatures need oxygen for cellular ...
of life”) as a synonym for air. One of the only surviving quotes by Anaximenes reads: “Just as our soul...being air holds us together, so ''pneuma'' and air encompass nd guardthe whole world.” The analogy compared atmospheric air as the divine and human air as souls that animate people. This relation of the macroscopic and microscopic suggested Anaximenes believed there was an overarching principle that regulated all life and behaviour. Interestingly, the
Old Testament The Old Testament (often abbreviated OT) is the first division of the Christian biblical canon, which is based primarily upon the 24 books of the Hebrew Bible or Tanakh, a collection of ancient religious Hebrew writings by the Israelites. The ...
features a similar analogy to the founding of the world and creation of man, but Anaximenes did not recognize a creator of the universe and did not think of the ''pneuma'' as a creator to guide man.


Condensation and rarefaction

The choice of air may seem arbitrary, but Anaximenes based his conclusion on naturally observable phenomena in the
water cycle The water cycle, also known as the hydrologic cycle or the hydrological cycle, is a biogeochemical cycle that describes the continuous movement of water on, above and below the surface of the Earth. The mass of water on Earth remains fairly cons ...
, and the processes of rarefaction and condensation. The primary difference in the forms of air as matter was the degree of condensation and density. When air condenses it becomes visible, and according to Anaximenes, the spread-out, invisible, infinite air was condensed to wind, then formed into clouds, which condensed further to produce mist, rain, and other forms of precipitation. As the condensed air cooled, Anaximenes supposed that Earth itself was an early condensate of air—the process continued until the air was condensed enough to form solids like the Earth and ultimately stones. By contrast, Anaximenes was able to visually see how water evaporates into air and based his concept of rarefaction on this observation. According to him, any object that held light was made of fire, and fire was made from the rarefaction of air. While other philosophers also recognized such transitions in states of matter, Anaximenes was the first to associate the qualitative change in hot/dry and cold/wet pairings with the density of a single material, effectively adding a quantitative dimension to the Milesian monistic system. He attributed condensation to cold/wet air and rarefaction to the interaction of hot/dry air.


Cosmology

Having concluded that everything in the world is composed of air, Anaximenes used his theory to devise a scheme that explains the origins and nature of the earth and the surrounding celestial bodies. Air felted to create the flat disk of the earth, which he said was table-like and behaved like a leaf floating on air. Anaximenes did not think that stars were floating leaf-like bodies similar to the earth and sun; instead, he thought of stars being similar to nails that are stuck in a transparent shell. In keeping with the prevailing view of celestial bodies as balls of fire in the sky, Anaximenes proposed that the earth let out an exhalation of air that rarefied, ignited and became the stars. While the sun is similarly described as being aflame, it is not composed of rarefied air like the stars, but rather of earth like the moon; its burning comes not from its composition but rather from its rapid motion. Similarly, he considered the moon and sun to be flat and floating on streams of air. In his theory, when the sun sets it does not pass under the earth, but is merely obscured by higher parts of the earth as it circles around and becomes more distant. Anaximenes likens the motion of the sun and the other celestial bodies around the earth to the way that a cap may be turned around the head.Graham, Daniel W
"Anaximenes"
The Internet Encyclopedia of Philosophy.
Anaximenes believed that the sky was a dome, and day and night are caused by celestial bodies being carried North until they are no longer seen. There is evidence that suggests Anaximenes may have been the first person to distinguish between planets and fixed stars.


Other phenomena

Anaximenes used his observations and reasoning to provide causes for other natural phenomena on the earth as well.
Earthquake An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in intensity, from ...
s, he asserted, were the result either of lack of moisture, which causes the earth to break apart because of how parched it is, or of superabundance of water, which also causes cracks in the earth. In either case the earth becomes weakened by its cracks, so that hills collapse and cause earthquakes.
Lightning Lightning is a naturally occurring electrostatic discharge during which two electric charge, electrically charged regions, both in the atmosphere or with one on the land, ground, temporarily neutralize themselves, causing the instantaneous ...
is similarly caused by the violent separation of clouds by the wind, creating a bright, fire-like flash.
Rainbow A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured circular arc. Rainbows c ...
s, on the other hand, are formed when densely compressed air is touched by the rays of the sun. These examples show how Anaximenes, like the other Milesian philosophers, looked for the broader picture in nature. They sought unifying causes for diversely occurring events, rather than treating each one on a case-by-case basis, or attributing them to gods or to a personified
nature Nature, in the broadest sense, is the physics, physical world or universe. "Nature" can refer to the phenomenon, phenomena of the physical world, and also to life in general. The study of nature is a large, if not the only, part of science. ...
.


Influence on philosophy

Since language and communication were very limited in his time, Anaximenes's analogies were key in explaining the uncertain through the certain. For example, he knew for certain that blowing air on his hand with his mouth wide open produced hot air, while blowing on his hand with half-closed lips produced cold air. These observations were key in his postulate that the hot air was due to rarefaction and expansion, whereas the cold air was due to condensation and compression. Although in modern times it is known that this is actually the opposite, Anaximenes was key in arriving at this conclusion. His analogies often connected parallels between man and the cosmos, insinuating that the same natural laws observable on earth applied to the heavens. Over 2000 years later,
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 ...
proved this to be true. Throughout history, Anaximenes's observations proved helpful to uncover powerful theories, such as
quantum physics Quantum mechanics is a fundamental theory in physics that provides a description of the physical properties of nature at the scale of atoms and subatomic particles. It is the foundation of all quantum physics including quantum chemistry, qua ...
and
chemical properties A chemical property is any of a material's properties that becomes evident during, or after, a chemical reaction; that is, any quality that can be established only by changing a substance's chemical identity.William L. Masterton, Cecile N. Hurley, ...
. By the end of the Milesian philosophy era, there were many questions left unanswered; this sparked the stimulation of Pre-socratic thought to continue through many other notable philosophers such as
Pythagoras Pythagoras of Samos ( grc, Πυθαγόρας ὁ Σάμιος, Pythagóras ho Sámios, Pythagoras the Samos, Samian, or simply ; in Ionian Greek; ) was an ancient Ionians, Ionian Ancient Greek philosophy, Greek philosopher and the eponymou ...
,
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 ...
,
Heraclitus Heraclitus of Ephesus (; grc-gre, Ἡράκλειτος , "Glory of Hera"; ) was an ancient Greek pre-Socratic philosopher from the city of Ephesus, which was then part of the Persian Empire. Little is known of Heraclitus's life. He wrote ...
, and
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 ...
. Anaximenes greatest influence is not from his theories of matter, but instead it is from how he thought about these ideas. For instance, his theory of air being the underlying substance was disproved, but when looking at his idea from a fundamental aspect, in which a substance is capable of changing forms, his theory was the first of its kind.


Pre-Socratic philosophy

The theories of Anaximenes were likely influential upon later Presocratic philosophers, and, according to classicist John Burnet, he was in his time a more important figure than his teacher Anaximander. Similarly to Anaximenes, the
Pythagoreans Pythagoreanism originated in the 6th century BC, based on and around the teachings and beliefs held by Pythagoras and his followers, the Pythagoreans. Pythagoras established the first Pythagorean community in the ancient Greek colony of Kroton, ...
, according to
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 ...
, believed that there was "boundless breath" which was "outside the heavens, and … was inhaled by the world". The cosmology of Anaxagoras shared many similarities with that of Anaximenes, and was likely influenced by it, while 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 ...
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 ...
and
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 ...
adopted Anaximenes' view that the world was flat.
Diogenes of Apollonia Diogenes of Apollonia ( ; grc, Διογένης ὁ Ἀπολλωνιάτης, Diogénēs ho Apollōniátēs; 5th century BC) was an ancient Greek philosopher, and was a native of the Milesian colony Apollonia in Thrace. He lived for some ti ...
took up the view of Anaximenes' that
air The atmosphere of Earth is the layer of gases, known collectively as air, retained by Earth's gravity that surrounds the planet and forms its planetary atmosphere. The atmosphere of Earth protects life on Earth by creating pressure allowing f ...
was the ''
arche ''Arche'' (; grc, ἀρχή; sometimes also transcribed as ''arkhé'') is a Greek word with primary senses "beginning", "origin" or "source of action" (: from the beginning, οr : the original argument), and later "first principle" or "element". ...
'', that it was the governing force and the source of everything in creation, and that all substances were the result of the condensation and rarefaction of air.


Plato and Aristotle

Many similarities to Anaximenes' theories are apparent in
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 ...
's theory. So much so, that some scholars have said Plato has based his theory of matter on Anaximenes's theory. In
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 ...
's view on Anaximenes, he interprets the theory as the one substance being air, and all other states of matter are different condensations of air. In Plato's interpretation of Anaximenes's theory, he considers the seven states of matter: fire, air, wind, clouds, earth and stone as different densities. Acknowledging that these seven states of matter are different densities shows how the intrinsic properties of the matter have changed, and they are actually different substances. Anaximenes supports this conclusion by his explanation using the concept of felting. Felting is a technological model used to explain condensation, in which wool turns into felt and has new properties. Just as how wind is compressed into clouds in Anaximenes's theory. Without recognizing Anaximenes's influence on Plato, and simply focusing on Anaximenes's influence on Aristotle, Anaximenes's contributions to scientific thought are not fully recognized. Aristotle interpreted Anaximenes's theory as all substance being different manifestations of air. It was Plato's interpretation of Anaximenes's theory that recognized the fundamental changes of air into other substances. Because Plato's theory does not recognize Anaximenes's by name, some scholars have doubted that Plato's theory was actually influenced by Anaximenes. The proponents of the influence have written that the uniqueness of Anaximenes's theory and obvious similarities to Plato's theory prove the connection.


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Anaximenes
at the
Internet Encyclopedia of Philosophy The ''Internet Encyclopedia of Philosophy'' (''IEP'') is a scholarly online encyclopedia, dealing with philosophy, philosophical topics, and philosophers. The IEP combines open access publication with peer reviewed publication of original pape ...

Anaximenes of Miletus
Life and Work - Fragments and Testimonies by Giannis Stamatellos {{DEFAULTSORT:Anaximenes Of Miletus 6th-century BC Greek people 6th-century BC philosophers Ancient Milesians Philosophers of ancient Ionia Presocratic philosophers