Properties of the solids are obtained by extrapolating functions of the dielectric constant and loss factor that are linearly related to the bulk density of the air particle mixture.

• 当已知待测材料的“固体密度”时，利用这些测得特性与混合物“松密度”的线性函数关系进行“外推”，从而获得“固体密度”下的农产品（或矿物）的微波介电特性。