Physical properties of greenhouse gases

## The Physical Properties of Greenhouse Gases

Gas  | Alternate Name  | Formula  | 1998 Level  | Increase since 1750  | Radiative forcing

(Wm−2)

| Specific heat at STP

(J kg−1)

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Carbon dioxide |  | (CO2) | 365ppm | 87 ppm | 1.46 | 819
Methane |  | (CH4) | 1,745ppb | 1,045ppb | 0.48 | 2191
Nitrous oxide |  | (N2O) | 314ppb | 44ppb | 0.15 | 880
Tetrafluoromethane | Carbon tetrafluoride | (CF4) | 80ppt | 40ppt | 0.003 | 1330
Hexafluoroethane |  | (C2F6) | 3 ppt | 3ppt | 0.001
Sulfur hexafluoride |  | (SF6) | 4.2ppt | 4.2ppt | 0.002
HFC-23* | Trifluoromethane | (CHF3) | 14ppt | 14ppt | 0.002
HFC-134a* | 1,1,1,2-tetrafluoroethane | (C2H2F4) | 7.5ppt | 7.5ppt | 0.001
HFC-152a* | 1,1-Difluoroethane | (C2H4F2) | 0.5ppt | 0.5ppt | 0.000
Water vapour |  | (H2O(G)) |  |  |  | 2000

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