Air  Thermal Conductivity vs. Temperature and Pressure
Online calculator with figures and tables showing air thermal conductivity vs. temperature and pressure. SI and imperial units.
Thermal conductivity is a material property that describes ability to conduct heat. Thermal conductivity can be defined as
"the quantity of heat transmitted through a unit thickness of a material  in a direction normal to a surface of unit area  due to a unit temperature gradient under steady state conditions".
Thermal conductivity most common units are W/(m K) in the SI system and Btu/(h ft °F) in the Imperial system.
Tabulated values and thermal conductivity units conversion are given below the figures.
Online Air Thermal Conductivity Calculator
The calculator below can be used to calculate the air thermal conductivity at given temperatures and pressure.
The output conductivity is given as mW/(m K), Btu(IT)/(h ft °F) and kcal(IT)/(h m K).
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 and Specific heat at varying pressure, Thermal Diffusivity, Properties at gasliquid equilibrium conditions and Air thermophysical properties at standard conditions and Composition and molecular weight,
as well as thermal conductivity of ammonia, butane, carbon dioxide, ethane, ethylene, hydrogen, methane, nitrogen, propane and water.
See also Conductive Heat Transfer Calculator
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Air thermal conductivity at atmospheric pressure and temperatures given in °C:
Temperature  Thermal conductivity  
[°C]  [mW/m K]  [kcal(IT)/(h m K)]  [Btu(IT)/(h ft °F)] 
190  7.82  0.00672  0.00452 
150  11.69  0.01005  0.00675 
100  16.20  0.01393  0.00936 
75  18.34  0.01577  0.01060 
50  20.41  0.01755  0.01179 
25  22.41  0.01927  0.01295 
15  23.20  0.01995  0.01340 
10  23.59  0.02028  0.01363 
5  23.97  0.02061  0.01385 
0  24.36  0.02094  0.01407 
5  24.74  0.02127  0.01429 
10  25.12  0.02160  0.01451 
15  25.50  0.02192  0.01473 
20  25.87  0.02225  0.01495 
25  26.24  0.02257  0.01516 
30  26.62  0.02289  0.01538 
40  27.35  0.02352  0.01580 
50  28.08  0.02415  0.01623 
60  28.80  0.02477  0.01664 
80  30.23  0.02599  0.01746 
100  31.62  0.02719  0.01827 
125  33.33  0.02866  0.01926 
150  35.00  0.03010  0.02022 
175  36.64  0.03151  0.02117 
200  38.25  0.03289  0.02210 
225  39.83  0.03425  0.02301 
300  44.41  0.03819  0.02566 
412  50.92  0.04378  0.02942 
500  55.79  0.04797  0.03224 
600  61.14  0.05257  0.03533 
700  66.32  0.05702  0.03832 
800  71.35  0.06135  0.04122 
900  76.26  0.06557  0.04406 
1000  81.08  0.06971  0.04685 
1100  85.83  0.07380  0.04959 
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Air thermal conductivity at atmospheric pressure and temperatures given in °F:
Temperature  Thermal conductivity  
[°F]  [Btu(IT)/(h ft °F)]  [kcal(IT)/(h m K)]  [mW/m K] 
300  0.00484  0.00720  8.37 
200  0.00788  0.01172  13.63 
100  0.01068  0.01589  18.48 
50  0.01200  0.01786  20.77 
20  0.01277  0.01901  22.10 
0  0.01328  0.01976  22.98 
10  0.01353  0.02013  23.41 
20  0.01378  0.02050  23.84 
30  0.01402  0.02087  24.27 
40  0.01427  0.02123  24.70 
50  0.01451  0.02160  25.12 
60  0.01476  0.02196  25.54 
70  0.01500  0.02232  25.95 
80  0.01524  0.02267  26.37 
100  0.01571  0.02338  27.19 
120  0.01618  0.02408  28.00 
140  0.01664  0.02477  28.80 
160  0.01710  0.02545  29.60 
180  0.01755  0.02612  30.38 
200  0.01800  0.02679  31.16 
250  0.01911  0.02843  33.07 
300  0.02018  0.03003  34.93 
350  0.02123  0.03160  36.75 
400  0.02226  0.03313  38.53 
450  0.02327  0.03463  40.28 
500  0.02426  0.03611  41.99 
600  0.02620  0.03898  45.34 
700  0.02807  0.04177  48.58 
800  0.02990  0.04449  51.74 
1000  0.03342  0.04973  57.84 
1200  0.03680  0.05477  63.69 
1400  0.04007  0.05963  69.35 
1600  0.04325  0.06436  74.85 
1800  0.04635  0.06898  80.23 
2000  0.04941  0.07353  85.51 
Thermal conductivity units conversion:
Thermal conductivity unit converter
british thermal unit(international)/(foot hour degree fahrenheit) [Btu(IT)/(ft h°F], british thermal unit(international)/(inch hour degree fahrenheit) [Btu(IT)/(in h°F], british thermal unit(international)*inch/(square foot*hour*degree fahrenheit) [(Btu(IT) in)/(ft² h°F)], kilocalorie/(meter hour degree celcius) [kcal/(m h°C)], joule/(centimeter second degree kelvin) [J/(cm s K)], watt/(meter degree kelvin) [W/(m°C)],
 1 Btu(IT)/(ft h°F) = 1/12 Btu(IT)/(in h°F) = 0.08333 Btu(IT)/(in h°F) = 12 Btu(IT)in/(ft^{2} h°F) = 1.488 kcal/(m h°C) = 0.01731 J/(cm s K) = 1.731 W/(m K)
 1 Btu(IT)/(in h°F) = 12 Btu(IT)/(ft h°F) = 144 Btu(IT)in/(ft^{2} h°F) = 17.858 kcal/(m h°C) = 0.20769 J/(cm s K)= 20.769 W/(m K)
 1 (Btu(IT) in)/(ft² h°F) = 0.08333 Btu(IT)/(ft h°F) = 0.00694 Btu(IT)/(in h°F) = 0.12401 kcal/(m h°C) = 0.001442 J/(cm s K) = 0.1442 W/(m K)
 1 J/(cm s K) = 100 W/(m K) = 57.789 Btu(IT)/(ft h°F) = 4.8149 Btu(IT)/(in h°F) = 693.35 (Btu(IT) in)/(ft² h°F) = 85.984 kcal/(m h°C)
 1 kcal/(m h°C) = 0.6720 Btu(IT)/(ft h°F) = 0.05600 Btu(IT)/(in h°F) = 8.0636 (Btu(IT) in)/(ft^{2} h°F) = 0.01163 J/(cm s K) = 1.163 W/(m K)
 1 W/(m K) = 0.01 J/(cm s K) = 0.5779 Btu(IT)/(ft h°F) = 0.04815 Btu(IT)/(in h°F) = 6.9335 (Btu(IT) in)/(ft² h°F) = 0.85984 kcal/(m h°C)
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