Amagat
An amagat is a practical unit of volumetric 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 and 0 °C. It is named after Émile Amagat, who also has Amagat's law named after him.
SI conversion
The amg unit for number density can be converted to the SI unit of moles per cubic meter by the formulawhere
In cgs units, one amagat in units of per cubic centimeter is:
The number density of an ideal gas at absolute pressure and absolute temperature can be calculated as
where = 273.15 K, and = 101.325 kPa.