The following tables give the thermal conductivity of some common gases (Table 1) and selected refrigerants (Table 2) as a function of temperature. In Table 1, the thermal conductivity values refer to a pressure of 100 kPa (1 bar) or to the saturation vapor pressure if that is less than 100 kPa. The difference between the thermal conductivity at 100 kPa and the limiting value at zero pressure is usually less than 1%. Uncertainties for the thermal conductivities of gases in this table are generally less than 3%; uncertainty information on specific fluids can be found in the references. Thermal conductivity is given in units of mW m–1 K–1. Column definitions for Table 1 are as follows.
Table 1 Column heading | Definition |
Mol. form. | Molecular formula; gases are listed in modified Hill order |
Gas | Gas name |
Low-pressure limiting value | “Yes” indicates data are low-pressure limiting values |
λ(100 K), λ(200 K), etc. | Thermal conductivity λ in mW m-1 K-1 at 100 K, 200 K, and other indicated temperatures |
Ref. | References |
In Table 2, thermal conductivity values are given for a few select refrigerants. Uncertainties for the thermal conductivities of refrigerants in this table are generally less than 3%; uncertainty information on specific fluids can be found in the references. Column definitions for Table 2 are as follows.
Table 2 Column heading | Definition |
Mol. form. | Molecular formula; gases are listed in modified Hill order |
Refrigerant | Refrigerant name |
Refrig. no. | Refrigerant code |
λ(300 K), λ(400 K), etc. | Thermal conductivity λ in mW m-1 K-1 at 300 K, 400 K, and other indicated temperatures |
Ref. | Reference |
Mol. form. | Gas | Low-pressure limiting value | λ(100 K)/mW m-1 K-1 | λ(200 K)/mW m-1 K-1 | λ(300 K)/mW m-1 K-1 | λ(400 K)/mW m-1 K-1 | λ(500 K)/mW m-1 K-1 | λ(600 K)/mW m-1 K-1 | Ref. |
Continued on next page... | |||||||||
Air | 9.5 | 18.5 | 26.4 | 33.5 | 39.9 | 46 | 1 | ||
Ar | Argon | Yes | 6.3 | 12.4 | 17.7 | 22.4 | 26.5 | 30.3 | 2,3* |
BF3 | Boron trifluoride | 19.0 | 24.6 | 4 | |||||
ClH | Hydrogen chloride | 9.8 | 15.0 | 19.8 | 24.2 | 28.3 | 5 | ||
F6S | Sulfur hexafluoride | 13.1 | 20.6 | 27.6 | 34.1 | 6 | |||
H2 | Normal hydrogen | Yes | 68.2 | 132.8 | 186.6 | 230.9 | 270.9 | 309.1 | 7 |
H2O | Water | Yes | 18.6 | 26.4 | 35.8 | 46.3 | 8 | ||
D2O | Deuterium oxide | Yes | 17.9 | 26 | 35.6 | 46.7 | 9 | ||
H2S | Hydrogen sulfide | Yes | 9.0 | 14.2 | 20.2 | 26.8 | 33.8 | 10 | |
H3N | Ammonia | 25.4 | 37.5 | 52.0 | 68.6 | 11 | |||
He | Helium | Yes | 74.7 | 118.3 | 155.7 | 189.6 | 221.4 | 251.6 | 12 |
Kr | Krypton | Yes | 3.3 | 6.4 | 9.5 | 12.2 | 14.7 | 17.0 | 13 |
NO | Nitric oxide | 17.8 | 25.9 | 33.1 | 39.6 | 46.2 | 4 | ||
N2 | Nitrogen | Yes | 9.2 | 18.3 | 25.9 | 32.6 | 38.9 | 45.1 | 14 |
N2O | Nitrous oxide | Yes | 9.7 | 17.1 | 25.3 | 33.6 | 41.8 | 15 | |
Ne | Neon | Yes | 22.3 | 37.4 | 49.4 | 59.9 | 69.5 | 78.5 | 16 |
O2 | Oxygen | 9.1 | 18.2 | 26.5 | 34.0 | 41.0 | 47.7 | 1 | |
O2S | Sulfur dioxide | 9.6 | 14.3 | 20.0 | 25.6 | 4 | |||
Xe | Xenon | Yes | 2.0 | 3.7 | 5.5 | 7.2 | 8.8 | 10.3 | 3*,17 |
|