Density and Boiling Points of Some Common Gases

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Name Symbol Density (g L-1 at STP*) Boiling Point (K at 1 atm)
Air 1.29
Ammonia NH3 0.771 240
Carbon dioxide CO2 1.98 195
Carbon monoxide CO 1.25 82
Chlorine Cl2 3.21 238
Hydrogen H2 0.0899 20
Hydrogen chloride HCl 1.64 188
Hydrogen sulfide H2S 1.54 212
Methane CH4 0.716 109
Nitrogen N2 1.25 77
Nitrogen (II) oxide NO 1.34 121
Oxygen O2 1.43 90
Sulfur dioxide SO2 2.92 263
* STP is defined as 273 K and 1 atm