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XTC601 User’s Manual
Michell Instruments 49
APPENDIX C
Appendix C Thermal Conductivity Table
Gas Formula Temperature=50°C (122°F)
in mW/(m.K)
Commonly Used Gases
Hydrogen H
2
196.86
Helium He 163.55
Methane CH
4
38.01
Oxygen O
2
28.24
Air N
2
/O
2
/Ar 27.64
Nitrogen N
2
27.57
Ethane C
2
H
6
24.63
Argon Ar 18.79
Carbon-dioxide CO
2
18.74
Other gases for reference
Ammonia NH
3
27.90
Nitric-oxide NO 27.57
Acetylene C
2
H
2
24.15
Ethylene C
2
H
4
23.86
Propane C
3
H
8
21.39
Water Vapour H
2
O 20.34
Butane C
4
H
10
19.39
Hydrogen-sulphide H
2
S 15.97
Hydrogen-chloride HCL 15.66
Sulphur-hexafluoride SF
6
14.76
Sulphur-dioxide SO
2
10.69
Note: This table is for reference purposes only. Please see order code sheet for what is
available.