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Anton Brugmans
Anton Brugmans (1732–1789) was Dutch physicist who proposed a two-fluid theory of magnetism. He did magnetism experiments by putting objects on water or mercury, using surface tension to make them float and magnets to move them. He discovered the diamagnetism of bismuth Bismuth is a chemical element with the Symbol (chemistry), symbol Bi and atomic number 83. It is a post-transition metal and one of the pnictogens, with chemical properties resembling its lighter group 15 siblings arsenic and antimony. Elemental .... Publications * Brugmans, Anton – Tentamina philosophica de materia magnetica eiusque actione in ferrum et magnetem, 1765 – BEIC 170767.jpg, ''Tentamina philosophica de materia magnetica eiusque actione in ferrum et magnetem'', 1765 References 1732 births 1789 deaths 18th-century Dutch physicists {{physicist-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diamagnetism
Diamagnetic materials are repelled by a magnetic field; an applied magnetic field creates an induced magnetic field in them in the opposite direction, causing a repulsive force. In contrast, paramagnetic and ferromagnetic materials are attracted by a magnetic field. Diamagnetism is a quantum mechanical effect that occurs in all materials; when it is the only contribution to the magnetism, the material is called diamagnetic. In paramagnetic and ferromagnetic substances, the weak diamagnetic force is overcome by the attractive force of magnetic dipoles in the material. The magnetic permeability of diamagnetic materials is less than the permeability of vacuum, ''μ''0. In most materials, diamagnetism is a weak effect which can be detected only by sensitive laboratory instruments, but a superconductor acts as a strong diamagnet because it repels a magnetic field entirely from its interior. Diamagnetism was first discovered when Anton Brugmans observed in 1778 that bismuth was repel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bismuth
Bismuth is a chemical element with the Symbol (chemistry), symbol Bi and atomic number 83. It is a post-transition metal and one of the pnictogens, with chemical properties resembling its lighter group 15 siblings arsenic and antimony. Elemental bismuth occurs naturally, and its sulfide and oxide forms are important commercial ores. The free element is 86% as dense as lead. It is a brittle metal with a silvery-white color when freshly produced. Passivation (chemistry), Surface oxidation generally gives samples of the metal a somewhat rosy cast. Further oxidation under heat can give bismuth a vividly Iridescence, iridescent appearance due to thin-film interference. Bismuth is both the most Diamagnetism, diamagnetic element and one of the least Thermal conductivity, thermally conductive metals known. Bismuth was long considered the element with the highest atomic mass whose nuclei do not spontaneously decay. However, in 2003 it was discovered to be extremely weakly radioactive. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1732 Births
Year 173 ( CLXXIII) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Severus and Pompeianus (or, less frequently, year 926 ''Ab urbe condita''). The denomination 173 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Roman Empire * Gnaeus Claudius Severus and Tiberius Claudius Pompeianus become Roman Consuls. * Given control of the Eastern Empire, Avidius Cassius, the governor of Syria, crushes an insurrection of shepherds known as the Boukoloi. Births * Maximinus Thrax ("the Thracian"), Roman emperor (d. 238) * Mi Heng, Chinese writer and musician (d. 198) Deaths * Donatus of Muenstereifel, Roman soldier and martyr (b. AD 140 Year 140 ( CXL) was a leap year starting on Thursday (link will display the full calendar) of the Julian cale ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1789 Deaths
Events January–March * January – Emmanuel Joseph Sieyès publishes the pamphlet '' What Is the Third Estate?'' ('), influential on the French Revolution. * January 7 – The 1788-89 United States presidential election and House of Representatives elections are held. * January 9 – Treaty of Fort Harmar: The terms of the Treaty of Fort Stanwix (1784) and the Treaty of Fort McIntosh, between the United States Government and certain native American tribes, are reaffirmed, with some minor changes. * January 21 – The first American novel, '' The Power of Sympathy or the Triumph of Nature Founded in Truth'', is printed in Boston, Massachusetts. The anonymous author is William Hill Brown. * January 23 – Georgetown University is founded in Georgetown, Maryland (today part of Washington, D.C.), as the first Roman Catholic college in the United States. * January 29 – In Vietnam, Emperor Quang Trung crushes the Chinese Qing forces in N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
