Science, Tech, Math › Science Faraday Constant Definition Share Flipboard Email Print Geoff Tompkinson/Science Photo Library/Getty Images Science Chemistry Chemical Laws Basics Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated February 19, 2019 The Faraday constant, F, is a physical constant equal to the total electric charge carried by one mole of electrons. The constant is named for English scientist Michael Faraday. The accepted value of the constant is: F = 96,485.3365(21) C/molF = 96 485.3329 s A / molF = 23.061 kcal per volt gram equivalentF = 26.801 A·h/mol Initially, the value of F was determined by weighing the mass of silver deposited in an electrochemical reaction in which the amount and duration of current were known. The Faraday constant is related to Avogadro's constant NA and the elementary charge of an electron e by the equation: F = e NA where: e ≈ 1.60217662×10−19 C NA ≈ 6.02214086×1023 mol−1 Faraday's Constant vs Faraday Unit The "faraday" is a unit of electrical charge that is equal to the magnitude of the charge of a mole of electrons. In other words, the Faraday constant equals 1 faraday. The "f" in the unit is not capitalized, while it is when referring to the constant. The faraday is rarely used, in favor of the SI unit of charge, the coulomb. An unrelated unit is a farad (1 farad = 1 coulomb / 1 volt), which is a unit of capacitance, also named for Michael Faraday.