Density of Gases at STP
Gas Density (g/L) Gas Density (g/L)
air, dry 1.2929 hydrogen
0.0899
ammonia 0.771 hydrogen chloride
1.639
carbon dioxide 1.977 methane
0.7165
carbon monoxide 1.250 sulphur dioxide
2.927
chlorine 3.214 nitrogen
0.716
dinitrogen monoxide 1.977 nitrogen monoxide
1.251
ethyne (acetylene)
1.171
oxygen
1.429
helium
0.1785