Abstract
Abstract A new method using powdered coal and paraffin wax was proposed for measuring the dielectric constant of coal concerned. In order to check the validity of this method, experiments were conducted on five coal specimens for which direct determination of dielectric constant had been made by the writers. Special attention was paid to the choice of a mixture formula and also to the influence of the electric conductivity upon the dielectric constant. It was concluded then that the present method could reproduce the dielectric constant of the coal with the fair precision of ± 10%. The microwave measurement on one specimen reveals that all the dipoles in coal are completely inhibited from rotation at this frequency.
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