Material Properties Useful for the Real Gas Model
	Substance	Formula	Molar Mass		Critical-Point Properties
					Temperature	Pressure	Volume
			M		Tcr	pcr	vcr
			kg/kmol		K	MPa	m³/kmol
	Air	--	28.97		132.5	3.77	0.0883
	Ammonia	NH3	17.03		405.5	11.28	0.0724
	Argon	Ar	39.948		151	4.86	0.0749
	Benzene	C6H6	78.115		562	4.92	0.2603
	Bromine	Br2	159.808		584	10.34	0.1355
	n-Butane	C4H10	58.124		425.2	3.8	0.2547
	Carbon Dioxide	CO2	44.01		304.2	7.39	0.0943
	Carbon Monoxide	CO	28.011		133	3.5	0.093
	Carbon Tetrachloride	CCl4	153.82		556.4	4.56	0.2759
	Chlorine	Cl2	70.906		417	7.71	0.1242
	Chloroform	CHCl3	119.38		536.6	5.47	0.2403
	Dichlorodifluoromethane (R-12)	CCl2F2	120.91		384.7	4.01	0.2179
	Dichlorofluoromethane (R-21)	CHCl2F	102.92		451.7	5.17	0.1973
	Ethane	C2H6	30.07		305.5	4.48	0.148
	Ethyl-Alcohol	C2H5OH	46.07		516	6.38	0.1673
	Ethylene	C2H4	28.054		282.4	5.12	0.1242
	Helium	He	4.003		5.3	0.23	0.0578
	n-Hexane	C6H14	86.179		507.9	3.03	0.3677
	Hydrogen (normal)	H2O	2.016		33.3	1.3	0.0649
	Krypton	Kr	83.8		209.4	5.5	0.0924
	Methane	CH4	16.043		191.1	4.64	0.0993
	Methyl alcohol	CH3OH	32.042		513.2	7.95	0.118
	Methyl chloride	CH3Cl	50.488		416.3	6.68	0.143
	Neon	Ne	20.183		44.5	2.73	0.0417
	Nitrogen	N2	28.013		126.2	3.39	0.0899
	Nitrous oxide	N2O	44.013		309.7	7.27	0.0961
	Oxygen	O2	31.999		154.8	5.08	0.078
	Propane	C3H8	44.097		370	4.26	0.1998
	Propylene	C3H6	42.081		365	4.62	0.181
	Sulfur dioxide	SO2	64.063		430.7	7.88	0.1217
	Tetrafluoroethane (R-134a)	CF3CH2F	102.03		374.3	4.067	0.1847
	Trichlorofluoromethane (R-11)	CCl3F	137.37		471.2	4.38	0.2478
	Water	H2O	18.015		647.3	22.09	0.0568
	Xenon	Xe	131.3		289.8	5.88	0.1186
	* The gas constant can be calculated from R = Rbar / Mbar, where Rbar = 8.314 kJ/kmol · K and Mbar is the molar mass.
	Source: www.nist.gov