Acoustic energy and momentum in a moving medium

By exploiting the mathematical analogy between the propagation of sound in a nonhomogeneous potential flow and the propagation of a scalar field in cu rved space-time, Various wave "energy" and wave "momentum'' conservation la ws are established in a systematic manner. In particular, the acoustic ener gy conservation law due to Blokhintsev appears as the result of the conserv ation of a mixed covariant and contravariant energy-momentum tensor, while the exchange of relative energy between the wave and mean flow, first noted by Longuet-Higgins and Stewart in the context of ocean waves, appears as t he covariant conservation of the doubly contravariant form of the same ener gy-momentum tensor.