The ratio of densities of hydrogen, deuterium and tritium under similar conditions of temperature and pressure

Hydrogen density =0.09 gL−1

Deuterium  density =0.18 gL−1

Tritium density =0.27 gL−1

The ratio of densities of ${\mathrm{H}}_2{\mathrm{D}}_2{\mathrm{T}}_2=1:2:3$