Difference between revisions of "Template:Base quantities and count"
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| thermodynamic temperature || ''T'' || Θ || [[kelvin]] || K | | thermodynamic temperature || ''T'' || Θ || [[kelvin]] || K | ||
|- | |- | ||
| [[amount]] of substance <sup>*,§</sup> || ''n'' = ''N''·''N''<sub>A</sub><sup>-1</sup> || N || [[mole]] || mol | | [[amount]] of substance <sup>*,§</sup> || ''n''<sub>E</sub> = ''N''<sub>E</sub>·''N''<sub>A</sub><sup>-1</sup> || N || [[mole]] || mol | ||
|- | |- | ||
| [[count]] <sup>*,$</sup> || ''N'' || X || counting unit || x | | [[count]] <sup>*,$</sup> || ''N''<sub>E</sub> || X || counting unit || x | ||
|- | |- | ||
| [[charge]] <sup>*,€</sup> || ''Q'' = ''N''·'' | | [[entity |elementary entity]] <sup>*,$</sup> || ''X''<sub>E</sub> || X || counting unit || x | ||
|- | |||
| [[Elementary charge |charge]] <sup>*,€</sup> || ''Q''<sub>E</sub> = ''N''<sub>E</sub>·''z''<sub>E</sub>·''e'' || I·T || coulomb || C = A·s | |||
|- | |- | ||
| luminous intensity || ''I''<sub>v</sub> || J || [[candela]] || cd | | luminous intensity || ''I''<sub>v</sub> || J || [[candela]] || cd | ||
|} | |} | ||
::::: [*] »[[SI base units]] | ::::: [*] »[[SI base units]], except for x. | ||
::::: <sup>*</sup> For the quantities ''n'', ''N'' and ''Q'', the | ::::: <sup>*</sup> For the quantities ''n'', ''N'', ''X'', and ''Q'', the type of entity E has to be specified in the text and indicated by a subscript: ''n''<sub>E</sub>; ''N''<sub>E</sub>; ''Q''<sub>''X''</sub>. | ||
::::: <sup>§</sup> '[[Amount]] is a counting quantity, converting the counting unit [x] into moles [mol] using the [[Avogadro constant]], ''N''<sub>A</sub>. | ::::: <sup>§</sup> '[[Amount]] is a counting quantity, converting the counting unit [x] into moles [mol] using the [[Avogadro constant]], ''N''<sub>A</sub>. | ||
::::: <sup>$</sup> '[[Count]]' | ::::: <sup>$</sup> '[[Count]]' equals the 'number of counting entities'. In the SI, the quantity 'count' is explicitly considered as an exception: "Each of the seven base quantities used in the SI is regarded as having its own dimension. .. All other quantities, with the exception of [[count]]s, are derived quantities" ([[Bureau International des Poids et Mesures 2019 The International System of Units (SI)]]). An elementary entity ''X''<sub>E</sub> is not a count (''X''<sub>E</sub> is not a number of ''X''<sub>E</sub>), but has the same dimension X and unit [x] as a count. | ||
::::: <sup>€</sup> | ::::: <sup>€</sup> Charge is a derived SI quantity, included here for comparison. Charge is a counting quantity, converting the counting unit [x] into coulombs [C] using the [[elementary charge]], ''e'', or converting moles [mol] into coulombs [C] using the [[Faraday constant]], ''F''. ''z''<sub>E</sub> is the charge number, which is a constant for a defined entity ''X''<sub>E</sub>. ''Q''<sub>E</sub> = ''n''<sub>E</sub>·''z''<sub>E</sub>·''F'' | ||
Revision as of 07:40, 6 June 2020
Base quantity Symbol for quantity Symbol for dimension Name of SI unit Symbol for SI unit [*] length l L meter m mass m M kilogram kg time t T second s electric current I I ampere A thermodynamic temperature T Θ kelvin K amount of substance *,§ nE = NE·NA-1 N mole mol count *,$ NE X counting unit x elementary entity *,$ XE X counting unit x charge *,€ QE = NE·zE·e I·T coulomb C = A·s luminous intensity Iv J candela cd
- [*] »SI base units, except for x.
- * For the quantities n, N, X, and Q, the type of entity E has to be specified in the text and indicated by a subscript: nE; NE; QX.
- § 'Amount is a counting quantity, converting the counting unit [x] into moles [mol] using the Avogadro constant, NA.
- $ 'Count' equals the 'number of counting entities'. In the SI, the quantity 'count' is explicitly considered as an exception: "Each of the seven base quantities used in the SI is regarded as having its own dimension. .. All other quantities, with the exception of counts, are derived quantities" (Bureau International des Poids et Mesures 2019 The International System of Units (SI)). An elementary entity XE is not a count (XE is not a number of XE), but has the same dimension X and unit [x] as a count.
- € Charge is a derived SI quantity, included here for comparison. Charge is a counting quantity, converting the counting unit [x] into coulombs [C] using the elementary charge, e, or converting moles [mol] into coulombs [C] using the Faraday constant, F. zE is the charge number, which is a constant for a defined entity XE. QE = nE·zE·F
