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physico chemical constant | | | | | | changes in value are due solely to an increase in measurement accuracy or convention | | fundamental physical constant | | | |
Loschmidt constant | J. Loschmidt (1821-1895) | 1865 | 0.0000047 × 1025 m-3 | This is the number of molecules in a cubic metre of an ideal gas at s.t.p. It is equal to the Avogadro constant divided by the molar volume. In Germany it is sometimes called Avogadro's constant. | | 2.6867775 × 1025 m-3 | n0 | | physico chemical constant | 273.15 K | 101.325 kPa |