Template:Keywords: Charge
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Terms and symbols in the context of charge
Charge of the proton versus charge per proton
- Proton charge is the elementary charge e [CΒ·x-1], which is charge QelH+ [C] of protons divided by the count NH+ [x] of protons. This distinction is not made sufficiently clear by IUPAC, when defining "-e is the charge of an electron" β it must be corrected to "-e is the charge per electron".
- For comparison, the name "charge density of electrons" is used by IUPAC with symbol Ο [CΒ·m-3]. Dividing Ο by the count concentration of electrons [xΒ·m-3], we obtain the unit [CΒ·x-1] for the electron charge. Therefore, electron charge (or proton charge) is clearly the charge per particle.
Ambiguity of QB
- IUPAC defines the charge number of an ion as: zB = QB/e. Therefore, QB = zBβe. The subscript in QB indicates per elementary entity B. This is opposite to the subscript in VB as the symbol for the volume of a substance of type B (e.g. VO2 [L]). For consistency with this convention, the symbol QelB or QelX [C] 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 QUX [Cβx-1]. To avoid too long and multiple subscript levels, QUX is used instead of QUX, and the βelβ is dropped from QelUX. The particle charge QUH+ of the proton is defined as elementary charge e. Therefore, the charge number of the proton is zH+ = QUH+/e = 1.
Keywords
- Β» charge QelX
- Β» charge number zX
- Β» electrochemical constant f
- Β» elementary charge e
- Β» Faraday constant F
- Β» particle charge QUX
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- Normalization of charge and canonical symbols
Quantity Unit Normalized for quantity Unit Canonical symbol Unit Practical symbol Quantity charge QelX [C] / count NX [x] = QUX [CΒ·x-1] particle charge (IUPAC: QB) charge QelX [C] / amount nX [mol] = QnX [CΒ·mol-1] charge number times Faraday constant charge QelX [C] / volume VX [m3] = QVX [CΒ·m-3] Οel charge density charge QelX [C] / mass mX [kg] = QmX [CΒ·kg-1] specific charge count NX [x] / charge QelX [C] = NeX [xΒ·C-1] amount nX [mol] / charge QelX [C] = neX [molΒ·C-1] volume VX [m3] / charge QelX [C] = QVX [m3Β·C-1] Οel-1 mass mX [kg] / charge QelX [C] = MeX [kgΒ·C-1]