Gases - Specific Gravities
Specific gravities of air, ammonia, butadiene, carbon dioxide, carbon monoxide and some other common gases. Specific gravity is the ratio between the density of an actual gas and the density of air at NTP (Normal Temperature and Pressure: 20°C and 1 atm).
| Gas | Specific Gravity |
|---|---|
| Acetylene (ethyne) - C2H2 | 0.899 |
| Air | 1 |
| 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 | 0.07 |
| 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 | 2.37 |
| 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 | 6.94 |
| 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 | 1.53 |
| n - Nonane | 4.4282 |
| n - Octane | 3.9439 |
| Oxygen - O2 | 1.1044 |
| Ozone | 1.66 |
| 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 |