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Timeline Of Chemistry
This timeline of chemistry lists important works, discoveries, ideas, inventions, and experiments that significantly changed humanity's understanding of the modern science known as chemistry, defined as the scientific study of the composition of matter and of its interactions. Known as "the central science", the study of chemistry is strongly influenced by, and exerts a strong influence on, many other scientific and technological fields. Many historical developments that are considered to have had a significant impact upon our modern understanding of chemistry are also considered to have been key discoveries in such fields as physics, biology, astronomy, geology, and materials science. Pre-17th century Prior to the acceptance of the scientific method and its application to the field of chemistry, it is somewhat controversial to consider many of the people listed below as "chemists" in the modern sense of the word. However, the ideas of certain great thinkers, either for the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
A New System Of Chemical Philosophy Fp
A, or a, is the first letter and the first vowel of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ''a'' (pronounced ), plural ''aes''. It is similar in shape to the Ancient Greek letter alpha, from which it derives. The uppercase version consists of the two slanting sides of a triangle, crossed in the middle by a horizontal bar. The lowercase version can be written in two forms: the double-storey a and single-storey ɑ. The latter is commonly used in handwriting and fonts based on it, especially fonts intended to be read by children, and is also found in italic type. In English grammar, " a", and its variant " an", are indefinite articles. History The earliest certain ancestor of "A" is aleph (also written 'aleph), the first letter of the Phoenician alphabet, which consisted entirely of consonants (for that reason, it is also called an abjad to distinguish it f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Icosahedron
In geometry, an icosahedron ( or ) is a polyhedron with 20 faces. The name comes and . The plural can be either "icosahedra" () or "icosahedrons". There are infinitely many non- similar shapes of icosahedra, some of them being more symmetrical than others. The best known is the ( convex, non- stellated) regular icosahedron—one of the Platonic solids—whose faces are 20 equilateral triangles. Regular icosahedra There are two objects, one convex and one nonconvex, that can both be called regular icosahedra. Each has 30 edges and 20 equilateral triangle faces with five meeting at each of its twelve vertices. Both have icosahedral symmetry. The term "regular icosahedron" generally refers to the convex variety, while the nonconvex form is called a ''great icosahedron''. Convex regular icosahedron The convex regular icosahedron is usually referred to simply as the ''regular icosahedron'', one of the five regular Platonic solids, and is represented by its Schläfli symbol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emerald Tablet
The ''Emerald Tablet'', also known as the ''Smaragdine Tablet'' or the ''Tabula Smaragdina'' (Latin, from the Arabic: , ''Lawḥ al-zumurrudh''), is a compact and cryptic Hermetic text. It was highly regarded by Islamic and European alchemists as the foundation of their art. Though attributed to the legendary Hellenistic figure Hermes Trismegistus, the text of the ''Emerald Tablet'' first appears in a number of early medieval Arabic sources, the oldest of which dates to the late eighth or early ninth century. It was translated into Latin several times in the twelfth and thirteenth centuries. Numerous interpretations and commentaries followed. Medieval and early modern alchemists associated the ''Emerald Tablet'' with the creation of the philosophers' stone and the artificial production of gold. It has also been popular with nineteenth and twentieth century occultists and esotericists, among whom the expression " as above, so below" (a modern paraphrase of the second verse ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mercury (element)
Mercury is a chemical element with the symbol Hg and atomic number 80. It is also known as quicksilver and was formerly named hydrargyrum ( ) from the Greek words, ''hydor'' (water) and ''argyros'' (silver). A heavy, silvery d-block element, mercury is the only metallic element that is known to be liquid at standard temperature and pressure; the only other element that is liquid under these conditions is the halogen bromine, though metals such as caesium, gallium, and rubidium melt just above room temperature. Mercury occurs in deposits throughout the world mostly as cinnabar ( mercuric sulfide). The red pigment vermilion is obtained by grinding natural cinnabar or synthetic mercuric sulfide. Mercury is used in thermometers, barometers, manometers, sphygmomanometers, float valves, mercury switches, mercury relays, fluorescent lamps and other devices, though concerns about the element's toxicity have led to mercury thermometers and sphygmomanometers being largely p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sulfur
Sulfur (or sulphur in British English) is a chemical element with the symbol S and atomic number 16. It is abundant, multivalent and nonmetallic. Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formula S8. Elemental sulfur is a bright yellow, crystalline solid at room temperature. Sulfur is the tenth most abundant element by mass in the universe and the fifth most on Earth. Though sometimes found in pure, native form, sulfur on Earth usually occurs as sulfide and sulfate minerals. Being abundant in native form, sulfur was known in ancient times, being mentioned for its uses in ancient India, ancient Greece, China, and ancient Egypt. Historically and in literature sulfur is also called brimstone, which means "burning stone". Today, almost all elemental sulfur is produced as a byproduct of removing sulfur-containing contaminants from natural gas and petroleum.. Downloahere The greatest commercial use of the element is the production ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apollonius Of Tyana
Apollonius of Tyana ( grc, Ἀπολλώνιος ὁ Τυανεύς; c. 3 BC – c. 97 AD) was a Greek Neopythagorean philosopher from the town of Tyana in the Roman province of Cappadocia in Anatolia. He is the subject of ''Life of Apollonius of Tyana'', written by Philostratus over a century after his death. Life dates Apollonius was born into a respected and wealthy Greek household. His primary biographer, Philostratus the Elder (circa 170c. 247), places him circa 3 BCc. 97 AD, however, the Roman historian Cassius Dio (c. 155 – c. 235 AD) writes that Apollonius was in his 40s or 50s in the 90s AD, from which the scholar, Maria Dzielska gives a birth year of about 40 AD. Sources The earliest and by far the most detailed source is the ''Life of Apollonius of Tyana'', a lengthy, novelistic biography written by the sophist Philostratus at the request of empress Julia Domna. She died in 217 AD and he completed it after her death, proba ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sirr Al-khaliqa
The ''Hermetica'' are texts attributed to the legendary Hellenistic figure Hermes Trismegistus, a syncretic combination of the Greek god Hermes and the Egyptian god Thoth. These texts may vary widely in content and purpose, but are usually subdivided into two main categories, the "technical" and "religio-philosophical" ''Hermetica''. The category of "technical" ''Hermetica'' encompasses a broad variety of treatises dealing with astrology, medicine and pharmacology, alchemy, and magic, the oldest of which were written in Greek and may go back as far as the second or third century BCE. Many of the texts belonging in this category were later translated into Arabic and Latin, often being extensively revised and expanded throughout the centuries. Some of them were also originally written in Arabic, though in many cases their status as an original work or translation remains unclear. These Arabic and Latin Hermetic texts were widely copied throughout the Middle Ages (the most famous ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alchemy
Alchemy (from Arabic: ''al-kīmiyā''; from Ancient Greek: χυμεία, ''khumeía'') is an ancient branch of natural philosophy, a philosophical and protoscientific tradition that was historically practiced in China, India, the Muslim world, and Europe. In its Western form, alchemy is first attested in a number of pseudepigraphical texts written in Greco-Roman Egypt during the first few centuries AD.Principe, Lawrence M. The secrets of alchemy'. University of Chicago Press, 2012, pp. 9–14. Alchemists attempted to purify, mature, and perfect certain materials. Common aims were chrysopoeia, the transmutation of "base metals" (e.g., lead) into "noble metals" (particularly gold); the creation of an elixir of immortality; and the creation of panaceas able to cure any disease. The perfection of the human body and soul was thought to result from the alchemical ''magnum opus'' ("Great Work"). The concept of creating the philosophers' stone was variously connected with all of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zosimos Of Panopolis
Zosimos of Panopolis ( el, Ζώσιμος ὁ Πανοπολίτης; also known by the Latin name Zosimus Alchemista, i.e. "Zosimus the Alchemist") was a Greco-Egyptian alchemist and Gnostic mystic who lived at the end of the 3rd and beginning of the 4th century AD. He was born in Panopolis (present day Akhmim, in the south of Roman Egypt), and flourished ca. 300. He wrote the oldest known books on alchemy, which he called "Cheirokmeta," using the Greek word for "things made by hand." Pieces of this work survive in the original Greek language and in translations into Syriac or Arabic. He is one of about 40 authors represented in a compendium of alchemical writings that was probably put together in Constantinople in the 7th or 8th century AD, copies of which exist in manuscripts in Venice and Paris. Stephen of Alexandria is another. Arabic translations of texts by Zosimos were discovered in 1995 in a copy of the book ''Keys of Mercy and Secrets of Wisdom'' by Ibn Al-Hassan I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atomism
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 appeared in both ancient Greek and ancient Indian philosophical traditions. Leucippus is the earliest figure whose commitment to atomism is well attested and he is usually credited with inventing atomism. He and other ancient Greek atomists theorized that nature consists of two fundamental principles: ''atom'' and ''void''. Clusters of different shapes, arrangements, and positions give rise to the various macroscopic substances in the world.Berryman, Sylvia, "Ancient Atomism", ''The Stanford Encyclopedia of Philosophy'' (Fall 2008 Edition), Edward N. Zalta (ed.)online/ref> The particles of chemical matter for which chemists and other natural philosophers of the early 19th century found experimental evidence were thought to be indivisibl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
On The Nature Of Things
''De rerum natura'' (; ''On the Nature of Things'') is a first-century BC didactic poem by the Roman poet and philosopher Lucretius ( – c. 55 BC) with the goal of explaining Epicurean philosophy to a Roman audience. The poem, written in some 7,400 dactylic hexameters, is divided into six untitled books, and explores Epicurean physics through poetic language and metaphors. Greenblatt (2011). Namely, Lucretius explores the principles of atomism; the nature of the mind and soul; explanations of sensation and thought; the development of the world and its phenomena; and explains a variety of celestial and terrestrial phenomena. The universe described in the poem operates according to these physical principles, guided by ''fortuna'' ("chance"), and not the divine intervention of the traditional Roman deities. Background To the Greek philosopher Epicurus, the unhappiness and degradation of humans arose largely from the dread which they entertained of the power of the deities, from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lucretius
Titus Lucretius Carus ( , ; – ) was a Roman poet and philosopher. His only known work is the philosophical poem ''De rerum natura'', a didactic work about the tenets and philosophy of Epicureanism, and which usually is translated into English as ''On the Nature of Things''—and somewhat less often as ''On the Nature of the Universe''. Lucretius has been credited with originating the concept of the three-age system that was formalised in 1836 by C. J. Thomsen. Very little is known about Lucretius's life; the only certainty is that he was either a friend or client of Gaius Memmius, to whom the poem was addressed and dedicated. ''De rerum natura'' was a considerable influence on the Augustan poets, particularly Virgil (in his ''Aeneid'' and ''Georgics'', and to a lesser extent on the ''Eclogues'') and Horace. The work was almost lost during the Middle Ages, but was rediscovered in 1417 in a monastery in Germany by Poggio Bracciolini and it played an important role both ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
