# Air - Thermal Conductivity vs. Temperature and Pressure

** 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).

Choose the actual unit of temperature:

Choose the actual pressure:

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 gas-liquid equilibrium conditions and Air thermophysical properties at standard conditions and Composition and molecular weight ,

as well as ** thermal conductivity ** o f ammonia , butane , carbon dioxide , ethane , ethylene , hydrogen , methane , nitrogen , propane and water .

See also Conductive Heat Transfer Calculator

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 |

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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