The Gas Density and Specific Volume Calculator calculates the density and specific volume of gas based on a modified version of the Ideal Gas Law:
where:
P is the absolute pressure of the gas,
V is the volume of the gas,
n is the number of moles of gas,
T is the absolute temperature of the gas,
R is the universal gas constant
The Ideal Gas Law assumes the existence of a gas with no volume and no interactions with other molecules. Therefore, the Compressibility Factor (Z) can be used for a slight alteration to the ideal gas law to account for real gas behavior. Therefore the equation used for these calculations is:
where:
P is the absolute pressure of the gas,
V is the volume of the gas,
n is the number of moles of gas,
T is the absolute temperature of the gas,
R is the universal gas constant
Z is the gas compressibility factor
This equation is sometimes referred to as the Non-Ideal Gas Law
This calculator has been scaled to use English units for temperature and pressure. Molecular weights for acetylene, air, ammonia, argon, carbon dioxide, carbon monoxide, chlorine, hydrogen, natural gas, nitrogen, oxygen, propane and steam are all provided.
Pressure: (psig)
Temperature: (F)
Compressibility Factor: (Help)
Determining Compressibility Factor Values
For lower presssures and small non-polar molecules a compressibility factor assummed value of 1 is a good first guess. At higher pressures and with larger molecular weight polar molucules the compressibility factor will fall below 1.
Molecular Weight: (lb/lbmol)
Typical Molecular Weight Values
 ACETYLENE 26 lb/lbmol AIR 29 lb/lbmol AMMONIA 17 lb/lbmol ARGON 39.9 lb/lbmol CARBON DIOXIDE 44 lb/lbmol CARBON MONOXIDE 28 lb/lbmol CHLORINE 70.9 lb/lbmol HYDROGEN 2 lb/lbmol NATURAL GAS 19.5 lb/lbmol NITROGEN 28 lb/lbmol OXYGEN 32 lb/lbmol PROPANE 44.1 lb/lbmol STEAM 18 lb/lbmol

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