Wikipedia:WikiProject Chemicals/Data book/Gas densities

The following gas densities were calculated from the van der Waals equation using published values of the van der Waals constants. All data as presented in these tables is for materials in their standard state, which is at 25 °C and 100 kPa by definition. If values are given for other conditions, this is explicitly indicated.

Source: Weast, R. C. (Ed.), Handbook of Chemistry and Physics (53rd Edn.), Cleveland:Chemical Rubber Co., 1972.