Air - Specific Heat vs. Pressure at Constant Temperature

Figures and tables with isobaric (Cp) and isochoric (Cv) specific heat of air at constant temperature and pressure ranging 0.01 to 10000 bara.

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Specific heat (C) is the amount of heat required to change the temperature of a mass unit of a substance by one degree.

Isobaric specific heat (C_p) is used for air in a constant pressure (ΔP = 0) system.
Isochoric specific heat (C_v) is used for air in a constant-volume, (= isovolumetric or isometric) closed system.

The specific heat of dry air - C_P and C_V - will vary with pressure and temperature. This may influence on the accuracy of industrial air handling process calculations. When calculating mass and volume flow of air in heated or cooled systems with high accuracy - the specific heat (= heat capacity) should be corrected according values in the figures and table below.

Specific Heat of dry air at constant temperature 20^oC / 68°F at various pressures:

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Specific Heat of dry air at selected temperatures at various pressures:

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Specific Heat of dry air at constant temperature 20^oC / 68°F at varying pressures:

For full table with Isochloric Heat Capacity - rotate the screen!

Pressure			Isobaric Specific Heat, Cp				Isochoric Specific Heat, Cv				Specific Heat Ratio
[atm]	[psia]	[kPa]	[kJ/(kg K)]	[kWh/(kg K)]	[kcal/(kg °C)], [Btu/(lb °F)]	[kcal/(lb °F)]	[kJ/(kg K)]	[kWh/(kg K)]	[kcal/(kg °C)], [Btu/(lb °F)]	[kcal/(lb °F)]	Cp/Cv
0.01	0.147	1.01325	1.0045	0.00027903	0.2399	0.1959	0.71740	0.00019928	0.1713	0.1399	1.4002
0.1	1.47	10.1325	1.0049	0.00027914	0.2400	0.1960	0.71763	0.00019934	0.1714	0.1399	1.4003
0.4	5.88	40.53	1.0053	0.00027925	0.2401	0.1960	0.71766	0.00019935	0.1714	0.1400	1.4008
1¹⁾	14.7	101.325	1.0061	0.00027947	0.2403	0.1962	0.71767	0.00019935	0.1714	0.1400	1.4019
7	102.9	709.28	1.0162	0.00028228	0.2427	0.1982	0.71913	0.00019976	0.1718	0.1402	1.4131
10	147	1013.25	1.0216	0.00028378	0.2440	0.1992	0.72005	0.00020001	0.1720	0.1404	1.4188
40	588	4053	1.0756	0.00029878	0.2569	0.2098	0.72858	0.00020238	0.1740	0.1421	1.4763
70	1029	7092.8	1.1305	0.00031403	0.2700	0.2205	0.73778	0.00020494	0.1762	0.1439	1.5323
100	1470	10132.5	1.1824	0.00032845	0.2824	0.2306	0.74703	0.00020751	0.1784	0.1457	1.5828

¹⁾ Standard atmosphere

Unit conversion:

british thermal unit(International table) = [Btu(IT)], degree celcius = [°C], degree fahrenheit = [°F], degree kelvin = [K], degree rankin = [°R], joule = [J], kilocalorie(International table) = [kcal(IT)], kilogram = [kg], kilojoule = [kJ], kilowatthour = [kWh], mole = [mol], pound =[lb]

K in the units can be replaced by °C, and vise versa. °R in the units can be replaced by °F, and vise versa.

1 Btu/(lb °F) = 1 Btu/(lb °R) = 1 kcal(IT)/(kg °C) = 1 kcal(IT)/(kg K) = 4186.8 J/(kg K) = 0.81647 kcal(IT)/(lb °F) = 1.163x10^-3 kWh/(kg K)
1 J/(kg K) = 1 J/(kg °C) = 2.3885x10^-4 kcal(IT)/(kg ^oC) = 2.3885x10^-4 Btu/(lb °F) = 1.9501x10^-4 kcal(IT)/(lb °F)
1 kcal(IT)/(kg °C) = 1 Btu/(lb °F) = 4186.8 J/(kg K) = 0.81647 kcal(IT)/(lb °F) = 1.163x10^-3 kWh/(kg K)
1 kcal(IT)/(lb °F) = 1.2248 Btu/(lb °F) = 1.2248 kcal(IT)/(kg °C) = 5127.9 J/(kg K)
1 kJ/(kg K) = 1 kJ/(kg °C) = 1000 J/(kg K) = 1000 J/(kg °C) = 0.23885 kcal(IT)/(kg °C) = 0.23885 Btu/(lb °F) = 0.19501 kcal(IT)/(lb °F) = 2.7778x10^-4kWh/(kg K)
1 kWh/(kg K) = 0.85985 kcal(IT)/(kg °C) = 0.85985 Btu/(lb °F) = 3.6 kJ/(kg K)
1 mol of air = 28.96546 g

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Air - Specific Heat vs. Pressure at Constant Temperature

Figures and tables with isobaric (Cp) and isochoric (Cv) specific heat of air at constant temperature and pressure ranging 0.01 to 10000 bara.

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