In the equation G=Ki (Cs-Cb), what does G stands for______________

Question

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G stands for the dissolution rate per unit area in this equation, which describes the rate at which a material dissolves in a solvent. The equation is a form of Fick's first law of diffusion, where G is the dissolution rate, K is a proportionality constant, i is the interfacial area, Cs is the saturation concentration of the solute, and Cb is the bulk concentration of the solute.

In the Equation G=Ki (Cs-Cb), What Does G Stands For______________