In physics and chemistry, the Faraday constant (named after Michael Faraday) is the magnitude of electric charge per mole of electrons. It has the currently accepted value
- F = 96,485.3365(21) C/mol.
The constant F has a simple relation to two other physical constants:
where:
- e ≈ 1.6021766×10−19 C;
- NA ≈ 6.022141×1023 mol−1.
NA is the Avogadro constant (the ratio of the number of particles 'N' to the amount of substance 'n' - a unit mole), and e is the elementary charge or the magnitude of the charge of an electron. This relation is true because the amount of charge of a mole of electrons is equal to the amount of charge in one electron multiplied by the number of electrons in a mole.
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, and using Faraday's law of electrolysis. Research is continuing into more accurate ways of determining the interrelated constants F, NA, and e.
Read more about Faraday Constant: Other Common Units of Faraday's Constant, Faraday Unit of Charge
Famous quotes containing the word constant:
“But labor of the hands, even when pursued to the verge of drudgery, is perhaps never the worst form of idleness. It has a constant and imperishable moral, and to the scholar it yields a classic result.”
—Henry David Thoreau (1817–1862)