The conduction of electricity in solid dielectrics is an exceedingly complicated phenomenon, and is usually influenced by the chemical, structural, and physical nature of the specimen. Results of experiments on various substances are often chaotic; the considerable lack of correspondence between specimens of the same kind is attributed generally to differences in chemical composition etc. and to differences in environmental conditions. However, it should be noted that agreement is possible only if the specific (ohmic) conductivity is measured.
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