Amount of substance | Physical constants

Loschmidt constant

The Loschmidt constant or Loschmidt's number (symbol: n0) is the number of particles (atoms or molecules) of an ideal gas in a given volume (the number density), and usually quoted at standard temperature and pressure. The 2014 CODATA recommended value is 2.6867811(15)×1025 per cubic metre at 0 °C and 1 atm and the 2006 CODATA recommended value was 2.686 7774(47)×1025 per cubic metre at 0 °C and 1 atm. It is named after the Austrian physicist Johann Josef Loschmidt, who was the first to estimate the physical size of molecules in 1865. The term "Loschmidt constant" is also sometimes used to refer to the Avogadro constant, particularly in German texts. The Loschmidt constant is given by the relationship: where p0 is the pressure, kB is the Boltzmann constant and T0 is the thermodynamic temperature. It is related to the Avogadro constant, NA, by: where R is the gas constant. Being a measure of number density, the Loschmidt constant is used to define the amagat, a practical unit of number density for gases and other substances: 1 amagat = n0 = 2.6867811×1025 m−3, such that the Loschmidt constant is exactly 1 amagat. (Wikipedia).

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Boltzmann constant | Avogadro's law | Planck constant | Relative atomic mass | Rydberg constant | Gas constant | Order of magnitude | Electron | Fine-structure constant | Number density | Amagat | Molar mass constant | Avogadro constant | Speed of light