Section: 6 | Thermal Conductivity of Gases and Refrigerants |

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THERMAL CONDUCTIVITY OF GASES AND REFRIGERANTS

Marcia L. Huber

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. Definitions of the data columns 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

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TABLE 1. Thermal Conductivity λ (mW m^-1 K^-1) of Common Gases as a Function of Temperature

Mol. form.	Gas	Low-pressure limiting value	λ(100 K)	λ(200 K)	λ(300 K)	λ(400 K)	λ(500 K)	λ(600 K)	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

^*References contain more accurate data covering a restricted temperature range.

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THERMAL CONDUCTIVITY OF GASES AND REFRIGERANTS