The Coefficient of Viscosity of Helium and the Coefficients of Slip of Helium and Oxygen by the Constant Deflection Method

Abstract

Coefficient of viscosity of helium by the constant deflection method.—Using carefully purified He, which showed only a spectroscopic trace of H, six series of measurements at about 23° C gave ${\eta }_{23}=1962.3\mathrm{} {\mathrm{}\left(10\right)\mathrm{}}^{-7\mathrm{}}$. This is about 2 per cent less than values obtained by the capillary method, but is believed correct to within 0.1 per cent.