GAS DENSITY
 

The density of a gas can be defined in three ways, exactly after the fashion of liquids. Mass density is defined in terms of the number of kilograms per meter cubed (kg/m³) that a sample of gas has. The weight density is defined in newtons per meter cubed (N/m³) and is equal to the mass density multiplied by the acceleration in meters per second squared (m/s²) to which the sample is subjected. The particle density is defined as the number of moles of atoms per meter cubed (mol/m³) in a parcel or sample of gas, where 1 mol ≈ 6.02 × 10²³.