The effective permittivity can be used to describe the molecular polarization of the mixture in the reaction and consequently be used to calculate the transmission and absorption of microwave in the reaction mixture 由于等效介电系数常常被用来描述在化学反应中微波的吸收和传输情况，因而，化学反应中反应物的等效介电系数就成为微波化学研究的关键问题之一。
