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  2. Avogadro constant - Wikipedia

    en.wikipedia.org/wiki/Avogadro_constant

    The Avogadro constant, commonly denoted N A [1] or L, [2] is an SI defining constant with an exact value of 6.022 140 76 × 10 23 mol −1 (reciprocal moles). [3] [4] It is this defined number of constituent particles (usually molecules, atoms, ions, or ion pairs—in general, entities) per mole and used as a normalization factor in relating the amount of substance, n(X), in a sample of a ...

  3. List of physical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_physical_constants

    Avogadro constant: 6.022 140 76 ... and is strongly dependent on how those units are defined. For example, the atomic mass constant is exactly known ...

  4. Avogadro's law - Wikipedia

    en.wikipedia.org/wiki/Avogadro's_Law

    For a given mass of an ideal gas, the volume and amount (moles) of the gas are directly proportional if the temperature and pressure are constant. The law is named after Amedeo Avogadro who, in 1812, [ 2 ] [ 3 ] hypothesized that two given samples of an ideal gas, of the same volume and at the same temperature and pressure, contain the same ...

  5. Number density - Wikipedia

    en.wikipedia.org/wiki/Number_density

    For any substance, the number density can be expressed in terms of its amount concentration c (in mol/m 3) as = where N A is the Avogadro constant. This is still true if the spatial dimension unit, metre, in both n and c is consistently replaced by any other spatial dimension unit, e.g. if n is in cm −3 and c is in mol/cm 3 , or if n is in L ...

  6. Ideal gas law - Wikipedia

    en.wikipedia.org/wiki/Ideal_gas_law

    Using simple algebra on equations , , and yields the result: = or =, where stands for the Boltzmann constant. Another equivalent result, using the fact that =, where n is the number of moles in the gas and R is the universal gas constant, is: =, which is known as the ideal gas law.

  7. Stoney units - Wikipedia

    en.wikipedia.org/wiki/Stoney_units

    Using the modern values for the Avogadro constant 6.022 14 × 10 23 mol −1 and for the volume of a gram-molecule under these conditions of 22.4146 × 10 6 mm 3, the modern value is 2.687 × 10 16, instead of Stoney's 10 18.

  8. 2019 revision of the SI - Wikipedia

    en.wikipedia.org/wiki/2019_revision_of_the_SI

    The mass of a silicon atom could be determined using the Avogadro project and using the Avogadro constant, it could be linked directly to the kilogram. [65] Concerns that the authors of the proposal had failed to address the impact of breaking the link between the mole, kilogram, dalton, and the Avogadro constant (N A) have also been expressed.

  9. Atomic mass - Wikipedia

    en.wikipedia.org/wiki/Atomic_mass

    where is the molar mass constant, is the Avogadro constant, [5] and () is the experimentally determined molar mass of carbon-12. [ 6 ] The relative isotopic mass (see section below) can be obtained by dividing the atomic mass m a of an isotope by the atomic mass constant m u yielding a dimensionless value .