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Encyclopedia > Faraday constant

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In physics and chemistry, the Faraday constant is the amount of electric charge in one mole of electrons. The Faraday constant was named after British scientist Michael Faraday. It is used in electrolytic system calculations to determine the mass of a chemical species that will collect at an electrode. Physics (from the Greek, (phúsis), nature and (phusiké), knowledge of nature) is the science concerned with the discovery and understanding of the fundamental laws which govern matter, energy, space, and time. ... Chemistry (from Greek χημεία khemeia[1] meaning alchemy) is the science of matter at the atomic to molecular scale, dealing primarily with collections of atoms, such as gases, molecules, crystals, and metals. ... Electric charge is a fundamental conserved property of some subatomic particles, which determines their electromagnetic interaction. ... The mole (symbol: mol) is the SI base unit that measures an amount of substance. ... The electron is a fundamental subatomic particle that carries a negative electric charge. ... Michael Faraday, FRS (September 22, 1791 – August 25, 1867) was an English chemist and physicist (or natural philosopher, in the terminology of that time) who contributed significantly to the fields of electromagnetism and electrochemistry. ...


It has the symbol F, and is given by

F=N_A cdot q,

where NA is Avogadro's number (approximately 6.02×1023 mole-1) and q is the magnitude of the charge on an electron (approximately 1.602×10−19 coulombs per electron). Avogadros number, also called Avogadros constant (NA), named after Amedeo Avogadro, is formally defined to be the number of carbon-12 atoms in 12 grams (0. ... The elementary charge (symbol e or sometimes q) is the electric charge carried by a single proton, or equivalently, the negative of the electric charge carried by a single electron. ... The electron is a fundamental subatomic particle that carries a negative electric charge. ... The coulomb (symbol: C) is the SI unit of electric charge. ...


The value of F was first determined by weighing the amount of silver deposited in an electrochemical reaction in which a measured current was passed for a measured time. This value was used to calculate Avogadro's number. Research is continuing into more accurate ways of determining F, and thereby NA. There are plans to use this value to redefine the kilogram in terms of a known number of atoms. [Source: NPL Annual Review 1999] General Name, Symbol, Number silver, Ag, 47 Chemical series transition metals Group, Period, Block 11, 5, d Appearance lustrous white metal Atomic mass 107. ... In electricity, current refers to electric current, which is the flow of electric charge. ... A pocket watch, a device used to keep time There are two distinct views on the meaning of time. ... The U.S. National Prototype Kilogram, which currently serves as the primary standard for measuring mass in the U.S. It was assigned to the United States in 1889 and is periodically recertified and traceable to the primary international standard, The Kilogram, held at the Bureau International des Poids et... Atomic redirects here. ... The National Physical Laboratory (NPL) is the national measurement standards laboratory for the United Kingdom, based at Bushy Park in Teddington, near London. ...

F = 96,485.3383(83) coulomb/mole

See also

Faradays law of electrolysis predicts the mass of material that will be deposited at an electrode during electrolysis. ... Michael Faraday, FRS (September 22, 1791 – August 25, 1867) was an English chemist and physicist (or natural philosopher, in the terminology of that time) who contributed significantly to the fields of electromagnetism and electrochemistry. ...

Reference

Peter J. Mohr, and Barry N. Taylor, CODATA Recommended Values of the Fundamental Physical Constants: 2002, Rev. Mod. Phys. vol. 77(1) 1-107 (2005)


  Results from FactBites:
 
Faraday constant: Definition and Links by Encyclopedian.com (240 words)
F is the Faraday constant, equal to 96,494 J volts -1 mol -1.
In physics and chemistry, the Faraday constant is the amount of electric charge of one mole of electrons.
The Faraday constant was named after British scientist Michael Faraday.
Faraday Crystals TGG and Glasses MOS-4 and MOS-10 (634 words)
Although the Faraday effect is not itself chromatic, the verdet constant itself is quite strongly a function of wavelength.
Faraday Isolators are passive unidirectional, non reciprocal devices that utilize the phenomenon of Magneto-Optic Rotation to isolate the source from reflections in an optical system.
Faraday Rotators are also used for example in ring laser systems to introduce a loss mechanism (in conjunction with some other intra-cavity polarization selective element) which is greater for one direction of propagation than for the other.
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