Gases - Specific Gravities

Specific gravity of air, ammonia, butadiene, carbon dioxide, carbon monoxide and some other common gases

Specific gravity for some common gases:

Gas Specific Gravity1)
- SG -
Acetylene (ethyne) - C2H2 0.90
Air1) 1.000
Alcohol vapor 1.601
Ammonia - NH3 0.59
Argon - Ar 1.38
Arsine 2.69
Benzene - C6H6 2.6961
Blast Furnace gas 1.02
Butadiene - C4H6 1.87
Butane - C4H10 2.0061
1-Butene (Butylene)- C4H8 1.94
Isobutene - C4H8 1.94
Carbon dioxide - CO2 1.5189
Carbon monoxide - CO 0.9667
Carbureted Water Gas 0.63
Chlorine - Cl2 2.486
Coke Oven Gas 0.44
Cyclobutane 1.938
Cyclopentane 2.422
Cyclopropane 1.451
Decane 4.915
Deutrium - D2 0.070
Digestive Gas (Sewage or Biogas) 0.8
Ethane - C2H6 1.0378
Ether vapor 2.586
Ethyl Chloride - C2H5Cl 2.23
Ethylene (Ethene) - C2H4 0.9683
Fluorine 1.31
Helium - He 0.138
Heptanes 3.459
Hexane 2.973
Hydrogen 0.0696
Hydrogen chloride - HCl 1.268
Hydrogen sulfide - H2S 1.1763
Hydrofluoric acid 2.370
Hydrochloric acid 1.261
Illuminating gas 0.4
Isobutane 2.01
Isopentane 2.48
Krypton 2.89
Marsh gas 0.555
Mercury vapor 6.940
Methane - CH4 0.5537
Methyl Chloride 1.74
Natural Gas (typical) 0.60 - 0.70
Neon 0.697
Nitric oxide - NO 1.037
Nitrogen - N2 (pure) 0.9669
Nitrogen - N2 (atmospheric) 0.9723
Nitrous oxide - N2O 1.530
Nonane 4.428
Octane 3.944
Oxygen - O2 1.1044
Ozone 1.660
Pentane 2.487
Phosgene 1.39
Propane - C3H8 1.5219
Propene (Propylene) - C3H6 1.4523
R-11 4.742
R-12 4.174
R-22 2.985
R-114 5.9
R-123 5.279
R-134a 3.522
Sasol 0.42
Silane 1.11
Sulfur Dioxide - SO2 2.264
Toluene-Methylbenzene 3.1082
Water gas (bituminous) 0.71
Water vapor 0.6218
Xenon 4.53

1) NTP - Normal Temperature and Pressure - is defined as 20oC (293.15 K, 68oF) and 1 atm ( 101.325 kN/m2, 101.325 kPa, 14.7 psia, 0 psig, 30 in Hg, 760 torr)

Since specific gravity is the ratio between the density (mass per unit volume) of an actual gas and the density of air - specific gravity has no dimension. The density of air at NTP is 1.205 kg/m3.

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