An amagat is a practical unit of number density. Although it can be applied to any substance at any conditions, it is defined as the number of ideal gas molecules per unit volume at 1 atm (= 101.325 kPa) and 0 °C (= 273.15 K). It is named after Emile Amagat, who also has Amagat's law named after him. The abbreviated form of amagat is "amg."
Number density in amg, denoted here by , is defined as
where n0 = 1 amg = 2.686 7805×1025 m−3 = 44.615 036 mol/m3 is the Loschmidt constant.
In practice, number density of an ideal gas at pressure P and temperature T can be calculated as
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