Difference between revisions of "Template:Base quantities and count"
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| [[amount]] of substance<sup>*</sup> || ''n'' || N || mole || mol | | [[amount]] of substance<sup>*</sup> || ''n'' || N || mole || mol | ||
|- | |- | ||
| | | [[count]]<sup>*,#</sup> || ''N'' || C || counting unit || x | ||
|- | |- | ||
| luminous intensity || ''I''<sub>v</sub> || J || candela || cd | | luminous intensity || ''I''<sub>v</sub> || J || candela || cd | ||
|} | |} | ||
:::: <sup>*</sup> For the quantities ''n'' and ''N'', the entities X have to be specified in the text or indicated by a subscript or in parentheses (IUPAC). | :::: <sup>*</sup> For the quantities ''n'' and ''N'', the entities X have to be specified in the text or indicated by a subscript or in parentheses (IUPAC). [[Concentration]] is expressed as amount of substance concentration, ''c''<sub>X</sub> = ''n''<sub>X</sub>·''V''<sup>-1</sup> [mol·L<sup>-1</sup>], count concentration, ''C''<sub>X</sub> = ''N''<sub>X</sub>·''V''<sup>-1</sup> [x·L<sup>-1</sup>], or other [[format]]s. | ||
:::: <sup>#</sup> 'Count' is synonymous with 'number of entities' and is one of the most fundamental quantities in physics, but the name, symbol and unit are not included in the SI as a base quantity or base unit. Not all sample types contain countable objects. An 'entity', X, is a countable object or event. Countable objects are particles, such as electrons, molecules, packaging units (parcels), cells, organisms, individuals, patients. 'Number of entities' and 'number' are distinguished (in German: Anzahl ''versus'' Zahl). The count is not a pure dimensionless number, but the dimension of the count, C, is the entity. The magnitude of a count, ''N'', is expressed by a pure number times the 'counting unit' [x], indicating how many times different members of the defined entity are ''accounted'' for in a defined system (not how many times the same member of the defined entity is re-counted in the system — consider the political problem | :::: <sup>#</sup> 'Count' is synonymous with '[[number of entities]]' and is one of the most fundamental quantities in physics, but the name, symbol and unit are not included in the SI as a base quantity or base unit. Not all sample types contain countable objects. An 'entity', X, is a countable object or event. Countable objects are particles, such as electrons, molecules, packaging units (parcels), cells, organisms, individuals, patients. 'Number of entities' and 'number' are distinguished (in German: Anzahl ''versus'' Zahl). The count is not a pure dimensionless number, but the dimension of the count, C, is the entity. The magnitude of a count, ''N'', is expressed by a pure number times the 'counting unit' [x], indicating how many times different members of the defined entity are ''accounted'' for in a defined system (not how many times the same member of the defined entity is re-counted in the system — consider the political problem of counting votes), or how many times a defined event is counted during a defined period of time. ''N'' is the count [x], and ''N''/''t'' is the frequency (counts per time in units of counting units per second [x·s<sup>-1</sup>]). A prefix can be used with the unit [x], like with any other symbol of SI units: Mx = 10<sup>6</sup> x; µx = 10<sup>-6</sup> x; Gx = 10<sup>9</sup> x; nx = 10<sup>-9</sup> x. | ||
Revision as of 16:47, 16 May 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* n N mole mol count*,# N C counting unit x luminous intensity Iv J candela cd
- * For the quantities n and N, the entities X have to be specified in the text or indicated by a subscript or in parentheses (IUPAC). Concentration is expressed as amount of substance concentration, cX = nX·V-1 [mol·L-1], count concentration, CX = NX·V-1 [x·L-1], or other formats.
- # 'Count' is synonymous with 'number of entities' and is one of the most fundamental quantities in physics, but the name, symbol and unit are not included in the SI as a base quantity or base unit. Not all sample types contain countable objects. An 'entity', X, is a countable object or event. Countable objects are particles, such as electrons, molecules, packaging units (parcels), cells, organisms, individuals, patients. 'Number of entities' and 'number' are distinguished (in German: Anzahl versus Zahl). The count is not a pure dimensionless number, but the dimension of the count, C, is the entity. The magnitude of a count, N, is expressed by a pure number times the 'counting unit' [x], indicating how many times different members of the defined entity are accounted for in a defined system (not how many times the same member of the defined entity is re-counted in the system — consider the political problem of counting votes), or how many times a defined event is counted during a defined period of time. N is the count [x], and N/t is the frequency (counts per time in units of counting units per second [x·s-1]). A prefix can be used with the unit [x], like with any other symbol of SI units: Mx = 106 x; µx = 10-6 x; Gx = 109 x; nx = 10-9 x.
