Mass Transfer
Which of the following has the same dimension as mass diffusivity?

Thermal diffusivity
Kinematic viscosity
Both Momentum flux & Kinematic viscosity
Momentum flux

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Mass Transfer
The rate of solid-liquid extraction is limited by the

Diffusion of the solute from the solution in contact with the particle to the main bulk of the solution
Diffusion of the solute through the solvent in the pores to the outside of the particle
All of these
Phase change of the solute as it dissolves in the solvent

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