Critical Properties of Phase-Change Fluids
Material Properties Useful for the Real Gas Model
Critical-Point Properties
Substance
Formula
Molar Mass
Temperature
Pressure
Volume
.
.
M
Tcr
Pcr
vcr
.
.
kg/kmol
K
MPa
m^3/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

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

Ethane
C2H6

30.07

305.5

4.48

0.148

Ethylene
C2H4

28.054

282.4

5.12

0.1242

Helium
He

4.003

5.3

0.23

0.0578

Hydrogen (normal)
H2

2.016

33.3

1.3

0.0649

Methane
CH4

16.043

191.1

4.64

0.0993

Neon
Ne

20.183

44.5

2.68

0.0419

Nitrogen
N2

28.013

126.2

3.39

0.0899

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

Water
H2O

18.015

647.1

22.064

0.0564

Note: The gas constant R can be calculated from R = R u /M, where:

R u is the Universal Gas Constant = 8.314 [kJ/kmol.K]
M is the Molar Mass [kg/kmol]

Adapted from TEST ( T he E xpert S ystem for T hermodynamics) < www.thermofluids.net > by S.Bhattacharjee, San Diego State University

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