Thermal Conductivity of Gases Chart

Heat Transfer Engineering and Design

This chart gives the thermal conductivity of gases as a function of temperature.

Unless otherwise noted, the values refer to a pressure of 100 kPa (1 bar) or to the saturation vapor pressure if that is less than 100 kPa.

The notation P = 0 indicates the low pressure limiting value is given. In general, the P = 0 and P = 100 kPa values differ by less than 1%.

Units: mW/m K ( milliwatts per meter kelvin).

MF	Name	100 K	200 K	300 K	400 K	500 K	600 K
-	Air	9.4	18.4	26.2	33.3	39.7	45.7
Ar	Argon	6.2	12.4	17.9	22.6	26.8	30.6
BF3	Boron trifluoride	-	-	19.0	24.6	-	-
H2	Hydrogen (P = 0)	68.6	131.7	186.9	230.4	-	-
F6S	Sulfur hexafluoride (P = 0)	-	-	13.0	20.6	27.5	33.8
H2O	Water	-	-	18.7	27.1	35.7	47.1
H2S	Hydrogen sulfide	-	-	14.6	20.5	26.4	32.4
NH3	Ammonia	-	-	24.4	37.4	51.6	66.8
He	Helium (P = 0)	75.5	119.3	156.7	190.6	222.3	252.4 8
Kr	Krypton (P = 0)	3.3	6.4	9.5	12.3	14.8	17.1
NO	Nitric oxide	-	17.8	25.9	33.1	39.6	46.2
N2	Nitrogen	9.8	18.7	26.0	32.3	38.3	44.0
N2O	Nitrous oxide	-	9.8	17.4	26.0	34.1	41.8
Ne	Neon (P = 0)	22.3	37.6	49.8	60.3	69.9	78.7
O2	Oxygen	9.3	18.4	26.3	33.7	41.0	48.1
O2S	Sulfur dioxide	-	-	9.6	14.3	20.0	25.6
Xe	Xenon (P = 0)	2.0	3.6	5.5	7.3	8.9	10.4
CCl2F2	Dichlorodifluoromethane	-	-	9.9	15.0	20.1	25.2
CF4	Tetrafluoromethane (P = 0)	-	-	16.0	24.1	32.2	39.9
CO	Carbon monoxide (P = 0)	-	-	25.0	32.3	39.2	45.7
CO2	Carbon dioxide	-	9.6	16.8	25.1	33.5	41.6
CHCl3	Trichloromethane	-	-	7.5	11.1	15.1	-
CH4	Methane	-	22.5	34.1	49.1	66.5	84.1
CH4O	Methanol	-	-	-	26.2	38.6	53.0
C2H2	Acetylene	-	-	21.4	33.3	45.4	56.8
C2H4	Ethylene	-	11.1	20.5	34.6	49.9	68.6
C2H6	Ethane	-	11.0	21.3	35.4	52.2	70.5
C2H6O	Ethanol	-	-	14.4	25.8	38.4	53.2
C3H6O	Acetone	-	-	11.5	20.2	30.6	42.7
C3H8	Propane	-	-	18.0	30.6	45.5	61.9
C4H10	Butane	-	-	16.4	28.4	43.0	59.1
C5H12	Pentane	-	-	14.4	24.9	37.8	52.7
C6H14	Hexane	-	-	-	23.4	35.4	48.7

Gases - Thermal Properties of Gases
Properties of Gases at Atmospheric Pressure

Gas	Temperature °C	Conductivity W/m-°C	Density kg/m3	Specific Heat J/kg-°C	Dynamic Viscosity kg/m-s	Kinematic Viscosity m2 /s	Thermal Diffusivity m2 /s
Helium	-129.0	0.0928	0.3379	5.2 x 103	12.55 x 10-6	37.11 x 10-6	52.75 x 10-6
Helium	-73.0	0.1177	0.2435	5.2 x 103	15.66 x 10-6	64.38 x 10-6	92.88 x 10-6
Helium	-18.0	0.1357	0.1906	5.2 x 103	18.17 x 10-6	95.5 x 10-6	136.75 x 10-6
Helium	93.0	0.1691	0.1328	5.2 x 103	23.05 x 10-6	173.6 x 10-6	244.9 x 10-6
Helium	204.0	0.197	0.10204	5.2 x 103	27.5 x 10-6	269.3 x 10-6	371.6 x 10-6
Helium	316.0	0.225	0.08282	5.2 x 103	31.13 x 10-6	375.8 x 10-6	521.5 x 10-6
Helium	427.0	0.251	0.07032	5.2 x 103	34.75 x 10-6	494.2 x 10-6	666.1 x 10-6
Helium	527.0	0.275	0.06023	5.2 x 103	38.17 x 10-6	634.1 x 10-6	877.4 x 10-6
Hydrogen	-123.0	0.0981	0.16371	12.602 x 103	5.595 x 10-6	34.18 x 10-6	47.5 x 10-6
Hydrogen	-73.0	0.1282	0.1227	13.54 x 103	6.813 x 10-6	55.53 x 10-6	77.2 x 10-6
Hydrogen	-23.0	0.1561	0.09819	14.059 x 103	7.919 x 10-6	80.64 x 10-6	113.0 x 10-6
Hydrogen	27.0	0.182	0.08185	14.314 x 103	8.963 x 10-6	109.5 x 10-6	155.4 x 10-6
Hydrogen	77.0	0.206	0.07016	14.436 x 103	9.954 x 10-6	141.9 x 10-6	203.1 x 10-6
Hydrogen	127.0	0.228	0.06135	14.491 x 103	10.864 x 10-6	177.1 x 10-6	256.8 x 10-6
Hydrogen	177.0	0.251	0.05462	14.499 x 103	11.779 x 10-6	215.6 x 10-6	316.4 x 10-6
Hydrogen	227.0	0.272	0.04918	14.507 x 103	12.636 x 10-6	257.0 x 10-6	381.7 x 10-6
Hydrogen	277.0	0.292	0.04469	14.532 x 103	13.475 x 10-6	301.6 x 10-6	451.6 x 10-6
Hydrogen	327.0	0.315	0.04085	14.537 x 103	14.285 x 10-6	349.7 x 10-6	530.6 x 10-6
Hydrogen	427.0	0.351	0.03492	14.574 x 103	15.89 x 10-6	455.1 x 10-6	690.3 x 10-6
Hydrogen	527.0	0.384	0.0306	14.675 x 103	17.4 x 10-6	569.0 x 10-6	856.3 x 10-6
Hydrogen	527.0	0.412	0.02723	14.821 x 103	18.78 x 10-6	690.0 x 10-6	0.0010217
Oxygen	-123.0	0.01367	2.619	917.8	11.49 x 10-6	4.387 x 10-6	5.688 x 10-6
Oxygen	-73.0	0.01824	1.9559	913.1	14.85 x 10-6	7.593 x 10-6	10.214 x 10-6
Oxygen	-23.0	0.02259	1.5618	915.7	17.87 x 10-6	11.45 x 10-6	15.794 x 10-6
Oxygen	27.0	0.02676	1.3007	920.3	20.63 x 10-6	15.86 x 10-6	22.353 x 10-6
Oxygen	77.0	0.0307	1.1133	929.1	23.16 x 10-6	20.8 x 10-6	29.68 x 10-6
Oxygen	127.0	0.03461	0.9755	942.0	25.54 x 10-6	26.18 x 10-6	37.68 x 10-6
Oxygen	177.0	0.03828	0.8682	956.7	27.77 x 10-6	31.99 x 10-6	46.09 x 10-6
Oxygen	227.0	0.04173	0.7801	972.2	29.91 x 10-6	38.34 x 10-6	55.02 x 10-6
Oxygen	277.0	0.04517	0.7096	988.1	31.97 x 10-6	45.05 x 10-6	64.1 x 10-6
Nitrogen	-73.0	0.01824	1.7108	1.0429 x 103	12.947 x 10-6	7.568 x 10-6	10.224 x 10-6
Nitrogen	27.0	0.0262	1.1421	1.0408 x 103	17.84 x 10-6	15.63 x 10-6	22.044 x 10-6
Nitrogen	127.0	0.03335	0.8538	1.0459 x 103	21.98 x 10-6	25.74 x 10-6	37.34 x 10-6
Nitrogen	227.0	0.03984	0.6824	1.0555 x 103	25.7 x 10-6	37.66 x 10-6	55.3 x 10-6
Nitrogen	327.0	0.0458	0.5624	1.0756 x 103	29.11 x 10-6	51.19 x 10-6	74.86 x 10-6
Nitrogen	427.0	0.05123	0.4934	1.0969 x 103	32.13 x 10-6	65.13 x 10-6	94.66 x 10-6
Nitrogen	527.0	0.05609	0.4277	1.1225 x 103	34.84 x 10-6	81.46 x 10-6	116.85 x 10-6
Nitrogen	627.0	0.0607	0.3796	1.1464 x 103	37.49 x 10-6	91.06 x 10-6	139.46 x 10-6
Nitrogen	727.0	0.06475	0.3412	1.1677 x 103	40.0 x 10-6	117.2 x 10-6	162.5 x 10-6
Nitrogen	827.0	0.0685	0.3108	1.1857 x 103	42.28 x 10-6	136.0 x 10-6	185.91 x 10-6
Nitrogen	927.0	0.07184	0.2851	1.2037 x 103	44.5 x 10-6	156.1 x 10-6	209.32 x 10-6
Carbon dioxide	-53.0	0.010805	2.4733	783.0	11.105 x 10-6	4.49 x 10-6	5.92 x 10-6
Carbon dioxide	-23.0	0.012884	2.1657	804.0	12.59 x 10-6	5.813 x 10-6	7.401 x 10-6
Carbon dioxide	27.0	0.016572	1.7973	871.0	14.958 x 10-6	8.321 x 10-6	10.588 x 10-6
Carbon dioxide	77.0	0.02047	1.5362	900.0	17.205 x 10-6	11.19 x 10-6	14.808 x 10-6
Carbon dioxide	127.0	0.02461	1.3424	942.0	19.32 x 10-6	14.39 x 10-6	19.463 x 10-6
Carbon dioxide	177.0	0.02897	1.1918	980.0	21.34 x 10-6	17.9 x 10-6	24.813 x 10-6
Carbon dioxide	227.0	0.03352	1.0732	1.013 x 103	23.26 x 10-6	21.67 x 10-6	30.84 x 10-6
Carbon dioxide	277.0	0.03821	0.9739	1.047 x 103	25.08 x 10-6	25.74 x 10-6	37.5 x 10-6
Carbon dioxide	327.0	0.04311	0.8938	1.076 x 103	26.83 x 10-6	30.02 x 10-6	44.83 x 10-6
Ammonia, NH 3	0.0	0.022	0.7929	2.177 x 103	9.353 x 10-6	11.8 x 10-6	13.08 x 10-6
Ammonia, NH 3	50.0	0.027	0.6487	2.177 x 103	11.035 x 10-6	17.0 x 10-6	19.2 x 10-6
Ammonia, NH 3	100.0	0.0327	0.559	2.236 x 103	12.886 x 10-6	23.0 x 10-6	26.19 x 10-6
Ammonia, NH 3	150.0	0.0391	0.4934	2.315 x 103	14.672 x 10-6	29.7 x 10-6	34.32 x 10-6
Ammonia, NH 3	200.0	0.0467	0.4405	2.395 x 103	16.49 x 10-6	37.4 x 10-6	44.21 x 10-6
Water vapor	107.0	0.0246	0.5863	2.06 x 103	12.71 x 10-6	21.6 x 10-6	20.36 x 10-6
Water vapor	127.0	0.0261	0.5542	2.014 x 103	13.44 x 10-6	24.2 x 10-6	23.38 x 10-6
Water vapor	177.0	0.0299	0.4942	1.98 x 103	15.25 x 10-6	31.1 x 10-6	30.7 x 10-6
Water vapor	227.0	0.0339	0.4405	1.985 x 103	17.04 x 10-6	38.6 x 10-6	38.7 x 10-6
Water vapor	277.0	0.0379	0.4005	1.997 x 103	18.84 x 10-6	47.0 x 10-6	47.5 x 10-6
Water vapor	327.0	0.0422	0.3652	2.026 x 103	20.67 x 10-6	56.6 x 10-6	57.3 x 10-6
Water vapor	377.0	0.0464	0.338	2.056 x 103	22.47 x 10-6	66.4 x 10-6	66.6 x 10-6
Water vapor	427.0	0.0505	0.314	2.085 x 103	24.26 x 10-6	77.2 x 10-6	77.2 x 10-6
Water vapor	477.0	0.0549	0.2931	2.119 x 103	26.04 x 10-6	88.8 x 10-6	88.3 x 10-6
Water vapor	527.0	0.0592	0.2739	2.152 x 103	27.86 x 10-6	102.0 x 10-6	100.1 x 10-6
Water vapor	577.0	0.0637	0.2579	2.186 x 103	29.69 x 10-6	115.2 x 10-6	113.0 x 10-6

References:

• Kadoya, K. Matsunaga, N., and Nagashima, A., Viscosity and thermal conductivity of dry air in the gaseous phase, J. Phys. Chem. Ref. Data, 14, 947, 1985.
• Younglove, B. A. and Hanley, H. J. M., The viscosity and thermal conductivity coefficients of gaseous and liquid argon, J. Phys. Chem. Ref. Data, 15, 1323, 1986.
• Holland, P. M., Eaton, B. E., and Hanley, H. J. M., A correlation of the viscosity and thermal conductivity data of gaseous and liquid ethylene, J. Phys. Chem. Ref. Data, 12, 917, 1983.