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×08th May 2019 @ 2 min read

The Loschmidt constant is also called as the Loschmidt number. The symbol used for the Loschmidt constant is *n*_{0}. It is the number of molecules of an ideal gas per unit volume. The Loschmidt constant has the unit of the reciprocal cubic metre. At STP (*P* = 1 atm, *T* = 273.15 K), The value of the constant is 2.686 781 1 × 10^{25} m^{−3}. The constant is a measure of number density.

The constant is named after Austrian scientist Johann Josef Loschmidt. In German literature, the Loschmidt constant is synonymous with the Avogadro's constant.

The Loschmidt constant for pressure *P*, and temperature *T* is

Here, *N*_{A} is the Avogadro's constant and *R* is the ideal gas constant.

At STP, the value of Loschmidt constant is

The relationship between the Loschmidt constant *n* and the Avogadro constant *N*_{A} is as follows:

The Loschmidt constant *n* and Boltzmann constant *k*_{B} are related by below equation.

The value of 1 amagat (amg) equals the value of the Loschmidt constant at STP

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