Measurement of dielectric constants of liquids using a parallel plate capacitor

초록

To estimate the dielectric constants of liquids we designed, a hollow acrylic box and derived formulas for the capacitance and the dielectric constant in a parallel plate capacitor with a hollow acrylic box. The dielectric constants of acrylic, distilled water, and sodium chloride aqueous solutions were obtained and compared with theoretical values. Due to the fringing effect, the measured capacitances of the parallel plate capacitor were found to have values different from the theoretical ones. Because our formulas for the capacitance do not involve the fringing effect, the experimental capacitance values should be corrected using the ratio of the experimental value to the theoretical value to lessen the error rates. By doing so, we obtained meaningful data for the dielectric constants and confirmed that the dielectric constant decreased linearly with increasing concentration of sodium chloride in an aqueous sodium-chloride solution. © 2021 The Korean Physical Society. All rights reserved.

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