The Magnetic Susceptibility of Gases I. Pressure Dependence

A method is described for measuring the magnetic susceptibility of gases which has certain advantages over those used by previous observers. With such an apparatus, it is found that the volume susceptibility of C${\mathrm{O}}_2$, ${\mathrm{N}}_2$ and ${\mathrm{H}}_2$ is proportional to the pressure. Deviations from proportionality of the type observed by Glaser are found in the above gases upon introducing water vapor as an impurity in amounts probably less than a few hundredths of a percent.