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Gases - Specific Gravities

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

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Specific gravity gases:

GasSpecific Gravity1)
- SG -
Acetylene (ethyne) - C2H2 0.899
Air1) 1.000
Alcohol vapor 1.601
Ammonia - NH3 0.59
Argon - Ar 1.38
Arsine 2.69
Benzene - C6H6 2.6969
Blast Furnace gas 1.02
1,2 - Butadiene - C4H6 1.8676
Butane - C4H10 2.0061
1-Butene (Butylene)- C4H8 1.9372
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
Cyclohexane 2.9057
Cyclopentane 2.4215
Cyclopropane 1.451
n - Decane 4.9125
Deutrium - D2 0.070
Digestive Gas (Sewage or Biogas) 0.8
2,3 - Dimethylbutane 2.9753
2,2 - Dimetylpentane 3.4596
Diisobutyl 3.9439
Ethane - C2H6 1.0378
Ether vapor 2.586
Ethylbenzene 3.6655
Ethyl Chloride - C2H5Cl 2.23
Ethylene (Ethene) - C2H4 0.9686
3 - Ethylpentane 3.4596
Fluorine 1.31
Helium - He 0.138
n - Heptane 3.4596
n - Hexane 2.9753
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 2.0068
Isobutene 1.9372
Isooctane 3.9439
Isopentane 2.4911
Isoprene 2.3519
Isopropylbenzene 4.1498
Krypton 2.89
Marsh gas 0.555
Mercury vapor 6.940
Methane - CH4 0.5537
Methylcyclopentane 2.9057
Methylcyclohexane 3.39
Methyl Chloride 1.74
2 - Methylhexane 3.4596
2 - Methylpentane 2.9753
Natural Gas (typical) 0.60 - 0.70
Neohexane 2.9753
Neopentane 2.4911
Neon 0.697
Nitric oxide - NO 1.037
Nitrogen - N2 (pure) 0.9669
Nitrogen - N2 (atmospheric) 0.9723
Nitrous oxide - N2O 1.530
n - Nonane 4.4282
n - Octane 3.9439
Oxygen - O2 1.1044
Ozone 1.660
n - Pentane 2.4911
Phosgene 1.39
Propane - C3H8 1.5219
Propene (Propylene) - C3H6 1.4529
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
Styrene 3.5959
Sulfur Dioxide - SO2 2.264
Toluene - Methylbenzene 3.1082
Triptane 3.4596
Water gas (bituminous) 0.71
Water vapor 0.6218
Xenon 4.53
o - Xylene 3.6655

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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