Specific Heats Common Gases

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Ideal-gas specific heats of various common gases At 300 K

Gas
Formula
Gas constant, R
cp
cv
k
kJ/kg · K
kJ/kg · K
kJ/kg · K
Air
0.2870
1.005
0.718
1.400
Argon
Ar
0.2081
0.5203
0.3122
1.667
Butane
C4H10
0.1433
1.7164
1.5734
1.091
Carbon dioxide
CO2
0.1889
0.846
0.657
1.289
Carbon monoxide
CO
0.2968
1.040
0.744
1.400
Ethane
C2H6
0.2765
1.7662
1.4897
1.186
Ethylene
C2H4
0.2964
1.5482
1.2518
1.237
Helium
He
2.0769
5.1926
3.1156
1.667
Hydrogen
H2
4.1240
14.307
10.183
1.405
Methane
CH4
0.5182
2.2537
1.7354
1.299
Neon
Ne
0.4119
1.0299
0.6179
1.667
Nitrogen
N2
0.2968
1.039
0.743
1.400
Octane
C8H18
0.0729
1.7113
1.6385
1.044
Oxygen
O2
0.2598
0.918
0.658
1.395
Propane
C3H8
0.1885
1.6794
1.4909
1.126
Steam
H2O
0.4615
1.8723
1.4108
1.327

Note: The unit kJ/kg · K is equivalent to kJ/kg · °C.
Source: Chemical and Process Thermodynamics 3/E by Kyle, B. G.

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