The ratio of the mass of a unit volume of gas to that of the same unit volume of dry air at normal conditions, i.e.. at an absolute pressure of 1013.25 hPa and at a temperature of 273.15 K. The density of air can be taken as 1.293 kg/m3.
The ratio of the mass of a unit volume of gas to that of the same unit volume of dry air at normal conditions, i.e.. at an absolute pressure of 1013.25 hPa and at a temperature of 273.15 K. The density of air can be taken as 1.293 kg/m3.