Difference between revisions of "Amount of substance"
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==Definition== | ==Definition== | ||
| − | The following definition has been proposed:<ref>{{citation | title = Amount of substance and the proposed redefinition of the mole | first1 = M. J. T. | last1 = Milton | first2 = I. M. | last2 = Mills | journal = Metrologia | year = 2009 | volume = 46 | pages = 332–38 | doi = 10.1088/0026-1394/46/3/022}}.</ref> | + | The following definition has been proposed:<ref>{{citation | title = Amount of substance and the proposed redefinition of the mole | first1 = M. J. T. | last1 = Milton | first2 = I. M. | last2 = Mills | journal = Metrologia | year = 2009 | volume = 46 | pages = 332–38 | doi = 10.1088/0026-1394/46/3/022}}.</ref><ref>{{citation | title = Consultative Committee for Amount of Substance: metrology in chemistry (CCQM): Report of the 15th meeting (22–24 April 2009) | url = http://www.bipm.org/utils/common/pdf/CCQM15.pdf | publisher = International Bureau for Weights and Measures | location = Sèvres, France | page = 7}}.</ref> |
<blockquote> | <blockquote> | ||
Amount of substance is a quantity that measures the size of an ensemble of entities. It is proportional to the number of specified entities and the constant of proportionality is the same for all substances. The entities may be atoms, molecules, ions, electrons, other particles, or specified groups of particles. | Amount of substance is a quantity that measures the size of an ensemble of entities. It is proportional to the number of specified entities and the constant of proportionality is the same for all substances. The entities may be atoms, molecules, ions, electrons, other particles, or specified groups of particles. | ||
Revision as of 14:05, 29 March 2010
Amount of substance (symbol: n) is a physical quantity, and one of the seven base quantities in the International System of Quantities.
Definition
The following definition has been proposed:[1][2]
Amount of substance is a quantity that measures the size of an ensemble of entities. It is proportional to the number of specified entities and the constant of proportionality is the same for all substances. The entities may be atoms, molecules, ions, electrons, other particles, or specified groups of particles.
References
- ↑ Milton, M. J. T.; Mills, I. M. Amount of substance and the proposed redefinition of the mole. Metrologia 2009, 46, 332–38. DOI: 10.1088/0026-1394/46/3/022.
- ↑ Consultative Committee for Amount of Substance: metrology in chemistry (CCQM): Report of the 15th meeting (22–24 April 2009); International Bureau for Weights and Measures: Sèvres, France; p 7, <http://www.bipm.org/utils/common/pdf/CCQM15.pdf>.
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