Units used by physicists to express the relative volume and density of gases. The amagat volume unit?is about 22.414 liters per mole (L/mol) or 0.022 414 m3/mol, the volume occupied by a gas at standard temperature (0.01 C) and standard pressure (1 atmosphere). The amagat density unit represents the corresponding relative density, which is equal to one kilomole per standard volume, or 44.615 moles per cubic meter (mol/m3), or 0.044 615 mole per liter (mol/L), again provided the measurement is made at standard temperature and pressure. In general, the ideal gas law shows that the relative density is equal to P/RT, where P is the pressure on the gas, T is the absolute temperature (in kelvins) and R is the universal gas constant, R = 8.314 joules per mole per kelvin. The unit honors the Dutch physicist E. H. Amagat (1841-1915), whose work included the study of gases under pressure