Gas Specific Gravity and Ideal Gas Law Calculator 
Gas Specific Gravity. Universal Gas Constant. Pressure, Temperature, Density, Mass, Volume using Ideal Gas Law. 

Gas Specific Gravity and Molecular Weight Conversion (free)
Units in gas specific gravity and ideal gas calculators: atm=atmosphere, C=Celsius, cm=centimeter, F=Fahrenheit, ft=foot, g=gram, kg=kilogram, m=meter, mm=millimeter, N=Newton, Pa=Pascal, psi=pound per square inch.
Equations for Gas Specific Gravity and Molecular Weight Conversion S = M / M_{air} , where S=gas specific gravity, M=gas molecular weight, M_{air}=28.96443 g/mole (molecular weight of standard air  CRC, 1983). The gas specific gravity calculation does not check for unreasonable inputs. Please enter positive values.
Equations for Ideal Gas Law Calculator (CRC, 1983) R_{u} = 8.3144126 Nm/moleK
The ideal gas law calculation internally converts all user inputs to SI units, performs the calculation, then converts calculated values to userdesired units. All molecular weights are from CRC (1983). The molecular weight of air is computed from the volume fractions of the individual components in air given by CRC (1983): Fractional Volumes of Components in Sea Level Dry Air (CRC, 1983)
References
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