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:
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:
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.
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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 Values)
Typical Molecular Weight Values
ACETYLENE26 lb/lbmol
AIR29 lb/lbmol
AMMONIA17 lb/lbmol
ARGON39.9 lb/lbmol
CHLORINE70.9 lb/lbmol
HYDROGEN2 lb/lbmol
NATURAL GAS19.5 lb/lbmol
NITROGEN28 lb/lbmol
OXYGEN32 lb/lbmol
PROPANE44.1 lb/lbmol
STEAM18 lb/lbmol

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GlobalSpec, Inc. engineering calculators are free for individuals to use via this site under the terms and conditions set out under the Terms of Use of this web site and supplemented by this Engineering Calculator Disclaimer. These calculators are intended solely for general information and educational purposes, and are provided to help decrease the learning curve for those inexperienced in the engineering field and to give more experienced users additional reference tools.

The engineering calculators provided are not intended in any way as engineering advice or services, or as a solicitation for any engineering product or service. Any results from use of these calculators may not be applicable or accurate with regard to the individual circumstances, cannot be relied upon for anything, including, without limitation, engineering designs or decisions, and should not be the basis for any action or inaction on your part. Read Entire Disclaimer

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