Compressible Fluids

Abstract

Although every fluid is compressible, gases exhibit this property most noticeably, and even here the compressibility property of a gas will have little influence except when the velocity is relatively large. To take compressibility into account we assume that the density ρ is a function of the pressure p, (whereas previously we always considered ρ a constant); it is more convenient, however, to consider the pressure as a function of the density, i.e., p = p(ρ).