Gnaiger E (2020) Mitochondrial pathways and respiratory control.IUPAC Green Book 3rd Edition, 2nd Printing, IUPAC & RSC Publishing, Cambridge. Cohen ER, Cvitas T, Frey JG, Holmström B, Kuchitsu K, Marquardt R, Mills I, Pavese F, Quack M, Stohner J, Strauss HL, Takami M, Thor HL (2008) Quantities, Units and Symbols in Physical Chemistry.Bureau International des Poids et Mesures (2019) The International System of Units (SI).Keywords » charge Q el X » charge number z X » electrochemical constant f » elementary charge e » Faraday constant F » hydrogen ion versus proton » iconic symbols » motive entity » particle charge Q NXįundamental relationships » Avogadro constant N A » Boltzmann constant k » elementary charge e » Faraday constant F » gas constant R » electrochemical constant f SI and related concepts » International System of Units » elementary unit x » SI prefixes » International Union of Pure and Applied Chemistry, IUPAC » entity » quantity » dimension » format » motive unit » iconic symbols Therefore, the charge number of the hydrogen ion is z H + = Q NH +/ e = 1. The particle charge Q NH + per hydrogen ion is identical to the definition of the elementary charge e. To avoid too long and multiple subscript levels, Q NX is used instead of Q U X, and the ‘el’ is dropped from Q el N X. For consistency with this convention, the symbol Q elB or Q el X is used for indicating charge of a substance of type B or X, distinguished from particle charge as the quantity of charge per elementary entity X with symbol Q NX. This is opposite to the subscript in V B as the symbol for the volume of a substance of type B (e.g. The subscript in Q B indicates per elementary entity B. Ambiguity of Q B IUPAC ( Cohen 2008 IUPAC Green Book) defines the charge number as IUPAC: z B = Q B Therefore, electron charge (or proton charge) is clearly the charge per particle. Dividing ρ by the count concentration of electrons, we obtain the unit for the electron charge. For comparison, the name "charge density of electrons" is used by IUPAC with symbol ρ. The distinction of charge of particles versus charge per single particle is not made sufficiently clear by IUPAC, when defining "- e is the charge of an electron" - it must be corrected to "- e is the charge per electron". 2.1 Charge of the proton versus charge per protonĬommunicated by Gnaiger E () last update Ĭanonical comments on IUPAC definitions in the context of charge Charge of the proton versus charge per proton Proton charge is the elementary charge e, which is charge per count of protons.2 Canonical comments on IUPAC definitions in the context of charge.
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