Measurement of the Dielectric Constant and Index of Refraction of Water and Aqueous Solutions of KCl at High Frequencies

Abstract

Dielectric constant of distilled water.—The dielectric constant of distilled water was measured with a vacuum tube source of voltage throughout a range of periods extending from about $T=1.31\mathrm{}\times {10}^{-8\mathrm{}}$ second to $T=8.49\mathrm{}\times {10}^{-8\mathrm{}}$ second corresponding to vacuum wave-lengths of 3.918 meters to 25.47 meters. The value obtained for the dielectric constant is $\epsilon =78.57\mathrm{}$ at 25°C and is independent of the period within the above range of periods.