Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

Air - Specific Heat at Constant Temperature and Varying Pressure

Figures and table showing isobaric (Cp) and isochoric (Cv) specific heat of air at constant temperature and varying pressure ranging 0.01 to 10000 bara

Sponsored Links

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

The specific heat of dry air - CP and CV - 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.

See also other properties of Air at varying temperature and pressure: Density and specific weight at varying temperature, Density at varying pressure, Diffusion Coefficients for Gases in Air, Prandtl Number, Specific heat at varying temperature, Thermal ConductivityThermal Diffusivity, Properties at gas-liquid equilibrium conditions and Air thermophysical properties at standard conditions and Composition and molecular weight,
as well as Specific heat of Ammonia, Butane, Carbon dioxide, Carbon monoxide, Ethane, Ethanol, Ethylene, Hydrogen, Methane, Methanol, Nitrogen, Oxygen, Propane and Water.

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


Back to top
Specific Heat of dry air at selected temperatures at various pressures:


Back to top
Specific Heat of dry air at constant temperature 20oC / 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) = 2.7778x10-4 kWh/(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

Back to top

Sponsored Links

Related Topics

Related Documents

Sponsored Links

Share

Search Engineering ToolBox

  • the most efficient way to navigate the Engineering ToolBox!

SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.

Topics

Unit Converters

Temperature

oC
oF


Load Calculator!

Length

m
km
in
ft
yards
miles
naut miles


Load Calculator!

Area

m2
km2
in2
ft2
miles2
acres


Load Calculator!

Volume

m3
liters
in3
ft3
us gal


Load Calculator!

Weight

kgf
N
lbf


Load Calculator!

Velocity

m/s
km/h
ft/min
ft/s
mph
knots


Load Calculator!

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O


Load Calculator!

Flow

m3/s
m3/h
US gpm
cfm


Load Calculator!

10 21

This website use cookies. By continuing to browse you are agreeing to our use of cookies! Learn more