Air - Specific Heat vs. Pressure at Constant Temperature

Specific heat (C) is the amount of heat required to change the temperature of a mass unit of a substance by one degree. This tool shows the relationship between specific heat (both isobaric Cp and isochoric Cv) and pressure at constant temperature (20°C / 68°F) for dry air.

Pressure (atm)	Isobaric Specific Heat Cp (kJ/kgK)	Isochoric Specific Heat Cv (kJ/kgK)	Specific Heat Ratio Cp/Cv	Cp (kWh/(kg K))	Cp (kcal/(kg °C))	Cp (Btu/(lb °F))	Cv (kWh/(kg K))	Cv (kcal/(kg °C))	Cv (Btu/(lb °F))
0.01	1.01325	0.7174	1.4002	0.00027903	0.2399	0.1959	0.00019928	0.1713	0.1399
0.1	10.1325	0.71763	1.4003	0.00027914	0.24	0.196	0.00019934	0.1714	0.1399
0.4	40.53	0.71766	1.4008	0.00027925	0.2401	0.196	0.00019935	0.1714	0.14
1	101.325	0.71767	1.4019	0.00027947	0.2403	0.1962	0.00019935	0.1714	0.14
7	709.28	0.71913	1.4131	0.00028228	0.2427	0.1982	0.00019976	0.1718	0.1402
10	1013.25	0.72005	1.4188	0.00028378	0.244	0.1992	0.00020001	0.172	0.1404
40	4053	0.72858	1.4763	0.00029878	0.2569	0.2098	0.00020238	0.174	0.1421
70	7092.8	0.73778	1.5323	0.00031403	0.27	0.2205	0.00020494	0.1762	0.1439
100	10132.5	0.74703	1.5828	0.00032845	0.2824	0.2306	0.00020751	0.1784	0.1457