This book is the second and substantially enlarged edition of the Springer Lecture Notes No. 88: Field Matter Interactions in Thermoelastic Solids, which appeared in 1978 and is out of print for about two decades. Since then, the basic issues addressed by the authors in that book have little changed: Because of the nonunique definition of the electromagnetic field quantities in ponderable bodies, constitutive postulates, e.g., for the stress tensor and other field quantities, must adequately be postulated, if two theories aiming to describe the same physical phenomenon yield for the same physical problem the same values of the observables. In the Lecture Notes, equivalence relations were established, which guarantee such equivalences for thermoelastic bodies, but no applications of the complex theory were given. Nevertheless, there was a continuous demand for the book, which was fulfilled by producing photocopies.