Ideal Gas Density Calculator

Your details

Choose a preset gas to auto-fill the molar mass, or select "Custom gas" to enter any value.
The molar mass of the gas in grams per mole. Auto-filled when a preset is selected.
g/mol
Select the unit for the pressure input.
The absolute (total) pressure of the gas. Use gauge pressure + atmospheric pressure for gauge readings.
atm
Select the unit for the temperature input.
The absolute temperature of the gas. Temperatures at or below absolute zero are invalid.
C
Choose the unit for the calculated density.
Gas densityNear air density
1.225

Mass per unit volume of the gas at the given conditions

Density unitkg/m3
Specific gas constant (Rs)287.04J/(kg*K)
Pressure (Pa)101,325Pa
Temperature (K)288.15K
1.225 kg/m3
Very light<0.5Lighter than air0.5-1Near air density1-1.5Heavier than air1.5-3Dense gas3+

Density: 1.2250 kg/m3

  • At these conditions, Air (dry) has a density of 1.2250 kg/m3.
  • This gas has almost exactly the same density as dry air at the same conditions.
  • The specific gas constant for this gas is 287.0 J/(kg*K), which scales pressure and temperature directly to density via rho = P / (Rs * T).
  • Density rises linearly with pressure and falls with increasing temperature at constant pressure, following the ideal gas law.

Next stepThe ideal gas law is accurate above about -50 C and below roughly 10 MPa for most common gases. Near the critical point or at very high pressures, use a real-gas equation of state such as van der Waals or Peng-Robinson instead.

 = Powered by OnlyCalculators