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Up till now this corresponds to a value of 6.02214179(30)*1023 elementary entities. (SI unit mol). (uncertainty +/- 5 ppb)

However this might (almost certainly) change in near future (2012?) when SI is 'updating' international standards, definitions and values of the fundamental constants.

(Yes, even the 'standard kilogram' might bere-defined; what a piety for the Paris Standard)


"The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12; its symbol is 'mol.' "

(14th CIPM (1971, Resolution 3; CR, 78)

In a note to the CIPM in October 2009, Ian Mills, the President of the CIPM (Consultative Committee - Units (CCU) cataloged the uncertainties of the fundamental constants of physics according to the current definitions and their values under the proposed new definition.

He urged the CIPM to accept the proposed changes in the definition of the ....

kilogram, ampere, kelvin and mole so that they are referenced to the values of the fundamental constants, namely Planck's constant (h), the electron charge (e), Boltzmann's constant (k), ....

.... and ....

Avogadro's constant (NA): [There is a broad consensus in the chemical community of the advantages in fixing NA, (fixing means: uncertainty nill ppb)]

Lit. cit. [ Ian Mills, President of the CCU (2009-10). "Thoughts about the timing of the change from the Current SI to the New SI". CIPM. Retrieved 2010-02-23.]

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Q: What does avogadro's number represent?
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