The Dielectric Constant of Commercial Nitrogen at High Pressures

The dielectric constant of commercial nitrogen, 99 percent pure, was measured at pressures up to 167 atmospheres by the same electrometric method previously employed by the writer in the determination of $K$ for air. ($K-1\mathrm{}$) was again found to vary directly with the pressure, at the rate of 556×${10}^{-6\mathrm{}}$ per atmosphere at 16.5°C, with the exception of an apparent slight deviation from linearity in the sense of a smaller rate of increase of $K$ with $P$ at pressures above 150 atmospheres. The greatest departure from linearity was only of the order of the probable error, however, and is not considered to be definitely established.