On arbitrariness in the choice of the tensor surface integration of impulse stream density in calculations of radiating pressure forces

The problem of choice invariance of a tensor surface integration of impulse stream density in calculations of radiation pressure forces (RPS) in the field of monochromatic sound wave is discussed. Cases of homogeneous and heterogeneous ideal and viscous liquids are regarded separately. It is confirmed that in the case of homogeneous ideal or viscous liquid such invariance exists, the fact earlier described by some authors. In case of smooth or intermittent heterogeneity in liquid such invariance seems to be unjust in spite of the fact that formally the averaged divergence of tensor of impulse stream density in the heterogeneity may identically equal to zero. The cause may be the appearance of the field dispersed on this heterogeneity.