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×An amagat is a unit of number density. It is similar to Loschmidt constant which is the molecular density quoted at STP (*T* = 273.15 K, *P* = 1 atm). 1 amagat is defined as the number of molecules of an ideal gas per unit volume at STP. 1 amagat is equivalent to Loschmidt constant. The symbol used for amagat is amg or Am (rarely). It is a non-SI unit.

The number is named after Émile Hilaire Amagat. He was a French physicist and also known for Amagat’s law of additive volume.

Amagat's Law of Additive Volumes

Amagat's law of additive volumes is the law of partial volumes. The law relates the total volume of a mixture with the volumes of individual components. Amagat's law is very similar to Dalton's law of partial pressure. The law is only valid for ideal gases. The law is named after Emile Amagat who was a French Physicist. He published his law of partial volumes in 1880.

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.

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