1. Material transfer in a phase
1.1 Molecular diffusion
In a fluid consisting of a single hydrodynamically immobile phase, or in a stationary flow (all the quantities describing the fluid are independent of time), as soon as there is heterogeneity in concentrations, there is a spontaneous evolution towards uniformity of these concentrations: this is due to molecular diffusion. This phenomenon tends to bring all systems to thermodynamic equilibrium, and is therefore general. Indeed, uniformity of concentration within the same phase is...
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Material transfer in a phase
Material transfer between two phases
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