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The transport and production of the generally non-conserved extensive property of volume V within a flowing gas or liquid is addressed. Specifically, a convective/diffusive/production-type transport equation, ρDmv^/Dt+∇·jv=πv, governing the transport of volume, is derived for the evolution of the fluid's specific volume v^=1/ρ. Here, ρ is the density, Dm/Dt the material derivative, jv the diffusive...
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