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Gases - Specific Heats and Individual Gas Constants

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The specific heat (= specific heat capacity) at constant pressure and constant volume processes, and the ratio of specific heats and individual gas constants - R - for some commonly used "ideal gases", are in the table below (approximate values at 68oF (20oC) and 14.7 psia (1 atm)).

For conversion of units, use the Specific heat online unit converter.

See also tabulated values of specific heat capacity of food and foodstuffmetals and semimetals, common liquids and fluids, common solids and other common substances as well as values of molar heat capacity of common organic substances and inorganic substances.

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Gases - Specific Heats and Individual Gas Constants
Gas or VaporFormulaSpecific HeatSpecific Heat RatioIndividual Gas constant
- R -
cp
(kJ/(kg K))
cv
(kJ/(kg K))
cp
(Btu/(lbmoF))
cv
(Btu/(lbmoF))
κ = cp / cvcp - cv
(kJ/(kg K))
cp - cv
(ft lbf/(lbmoR))
Acetone (CH3)2CO 1.47 1.32 0.35 0.32 1.11 0.15
Acetylene C2H2 1.69 1.37 0.35 0.27 1.232 0.319 59.34
Air 1.01 0.718 0.24 0.17 1.40 0.287 53.34
Alcohol (ethanol) C2H5OH 1.88 1.67 0.45 0.4 1.13 0.22
Alcohol (methanol) CH3OH 1.93 1.53 0.46 0.37 1.26 0.39
Ammonia NH3 2.19 1.66 0.52 0.4 1.31 0.53 96.5
Argon Ar 0.520 0.312 0.12 0.07 1.667 0.208
Benzene C6H6 1.09 0.99 0.26 0.24 1.12 0.1
Blast furnace gas 1.03 0.73 0.25 0.17 1.41 0.3 55.05
Bromine Br2 0.25 0.2 0.06 0.05 1.28 0.05
Butane C4H10 1.67 1.53 0.395 0.356 1.094 0.143 26.5
Carbon dioxide CO2 0.844 0.655 0.21 0.16 1.289 0.189 38.86
Carbon monoxide CO 1.02 0.72 0.24 0.17 1.40 0.297 55.14
Carbon disulphide CS2 0.67 0.55 0.16 0.13 1.21 0.12
Chlorine Cl2 0.48 0.36 0.12 0.09 1.34 0.12
Chloroform CHCl3 0.63 0.55 0.15 0.13 1.15 0.08
Coal gas 2.14 1.59
Combustion products 1 0.24
Ethane C2H6 1.75 1.48 0.39 0.32 1.187 0.276 51.5
Ether (diethyl ether) (C2H5)2O 2.01 1.95 0.48 0.47 1.03 0.06
Ethylene C2H4 1.53 1.23 0.4 0.33 1.240 0.296 55.08
Chlorodifluoromethane, R-22  CHClF2         1.18    
Helium He 5.19 3.12 1.25 0.75 1.667 2.08 386.3
Hexane  C6H14         1.06    
Hydrochloric acid 0.795 0.567
Hydrogen H2 14.32 10.16 3.42 2.43 1.405 4.12 765.9
Hydrogen Chloride HCl 0.8 0.57 0.191 0.135 1.41 0.23 42.4
Hydrogen Sulfide H2S 0.243 0.187 1.32 45.2
Hydroxyl OH 1.76 1.27     1.384 0.489  
Krypton Kr 0.25 0.151
Methane CH4 2.22 1.70 0.59 0.45 1.304 0.518 96.4
Methyl Chloride CH3Cl 0.240 0.200 1.20 30.6
Natural Gas 2.34 1.85 0.56 0.44 1.27 0.5 79.1
Neon Ne 1.03 0.618     1.667 0.412  
Nitric Oxide NO 0.995 0.718 0.23 0.17 1.386 0.277
Nitrogen N2 1.04 0.743 0.25 0.18 1.400 0.297 54.99
Nitrogen tetroxide N2O4 4.69 4.6 1.12 1.1 1.02 0.09
Nitrous oxide N2O 0.88 0.69 0.21 0.17 1.27 0.18 35.1
Oxygen O2 0.919 0.659 0.22 0.16 1.395 0.260 48.24
Pentane C5H12         1.07    
Propane C3H8 1.67 1.48 0.39 0.34 1.13 0.189 35.0
Propene (propylene) C3H6 1.5 1.31 0.36 0.31 1.15 0.18 36.8
Water Vapor
Steam 1 psia. 120 – 600 oF
H2O 1.93 1.46 0.46 0.35 1.32 0.462
Steam 14.7 psia. 220 – 600 oF H2O 1.97 1.5 0.47 0.36 1.31 0.46
Steam 150 psia. 360 – 600 oF H2O 2.26 1.76 0.54 0.42 1.28 0.5
Sulfur dioxide (Sulphur dioxide) SO2 0.64 0.51 0.15 0.12 1.29 0.13 24.1
Xenon Xe 0.16 0.097

For conversion of units, use the Specific heat online unit converter.

See also tabulated values of specific heat of food and foodstuffmetals and semimetals, common liquids and fluidsCommon solids and other common substances as well as values of molar heat capacity of common organic substances and inorganic substances.

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