Gas Density

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Density of an ideal gases is a function of pressure, molecular weight of the pure gas or mixture and the temperature of the gas.

Ideal gas equation is,

PV = nRT

where,

P = Pressure (bar, atmosphere, Pa)

V = Gaseous volume (m³, cm³)

n = number of gaseous moles (dimensionless)

R = Universal gas constant (J/mol.K, lit.atm/mol.K)

T = Temperature of the gas (K)

Let

M = molecular weight of the gaseous phase

W = n X M =  mass of the gaseous phase

Hence,

PV = (W/M) RT

PM / RT = W/V

W/V = ρ = mass per unit volume, i.e. density (kg/m³, gm/cm³)

ρ = PM / RT

For a real gas with compressibility factor z,

ρ = PM / zRT

Gas Density calculator

Inputs

Molecular Weight
Compressibility (z)
Pressure	Pa kPa bar mbar μbar atm in. water in.Hg mmHg lbforce/sq.in lbforce/sq.ft kgforce/sq.cm kgforce/sq.m torr
Temperature	deg.C deg.F deg.Rankine Kelvin
Calculated gas density =	kg/m3

Also refer to EnggCyclopedia’s Liquid Density Calculator.