Abstract
Since most of the systems to which microwaves are applied are heterogeneous, the dielectric properties of heterogeneous mixtures are treated, and especially the properties of mixtures containing water, This approach elucidates many of the phenomena which contribute to the general behaviour of many systems when they are brought into a microwave field. Some possible applications and some implications of the theory are treated, heterogeneous mixtures and especially of mixtures containing water, together with some implications and applications of the theory are treated.

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