Difference between revisions of "Molar mass constant"
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| − | The '''molar mass constant''' (symbol: '''''M''<sub>u</sub>''') is a [[physical constant]] connecting [[atomic weight]] and [[molar mass]]. Under the 1972 definition of the [[mole]],<ref name="SI114-15">{{SIbrochure8th|pages=114–15}}.</ref> it has a defined value in [[SI units]] of {{nowrap|1 g mol<sup>−1</sup>}}.<ref name="CODATA2006">{{CODATA 2006|url=http://physics.nist.gov/cgi-bin/cuu/Value?mu}}.</ref> | + | The '''molar mass constant''' (symbol: '''''M''<sub>u</sub>''') is a [[physical constant]] connecting [[atomic weight]] and [[molar mass]]. Under the 1972 definition of the [[mole]],<ref name="SI114-15">{{SIbrochure8th|pages=114–15}}.</ref> it has a defined value in [[SI units]] of {{nowrap|1 g mol<sup>−1</sup>}}.<ref name="CODATA2006">{{CODATA 2006|url=http://physics.nist.gov/cgi-bin/cuu/Value?mu}}.</ref> Although it is not explicitly used in routine work, the constant is important for the formal coherence of the [[International System of Units]] (SI): it indicates where the factor of {{nowrap|10<sup>−3</sup> kg mol<sup>−1</sup>}} should appear in equations between [[Molar quantity|molar]] and [[Specific quantity|mass-based quantities]] and ensures that such equations need no additional numerical factor.<ref name="Milton&Mills">{{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> |
==References== | ==References== | ||
Latest revision as of 15:45, 21 March 2010
The molar mass constant (symbol: Mu) is a physical constant connecting atomic weight and molar mass. Under the 1972 definition of the mole,[1] it has a defined value in SI units of 1 g mol−1.[2] Although it is not explicitly used in routine work, the constant is important for the formal coherence of the International System of Units (SI): it indicates where the factor of 10−3 kg mol−1 should appear in equations between molar and mass-based quantities and ensures that such equations need no additional numerical factor.[3]
References
- ↑ The International System of Units (SI), 8th ed.; International Bureau of Weights and Measures: Sèvres, France, 2006; pp 114–15. ISBN 92-822-2213-6, <http://www.bipm.org/utils/common/pdf/si_brochure_8_en.pdf>.
- ↑ Mohr, Peter J.; Taylor, Barry N.; Newell, David B. CODATA Recommended Values of the Fundamental Physical Constants: 2006. Rev. Mod. Phys. 2008, 80 (2), 633–730. doi:10.1103/RevModPhys.80.633, <http://physics.nist.gov/cuu/Constants/codata.pdf>. Direct link to value.
- ↑ 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.
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