Question

In the equation, V dC/dt = dm/dt = A(Cs-Cb).√ γ D, what does γ stands for?

(a) Mass of the solid dissolved

(b) Rate of surface renewal

(c) Concentration of solute

(d) Concentration of the drug

The question was posed to me in class test.

The query is from Physicochemical Factors Affecting Drug Absorption in section Absorption of Drugs of Drug Biotechnology

Answer 1

Correct answer is (b) Rate of surface renewal

Best explanation: The Danckwert’s model is expressed by the equation, V dC/dt = dm/dt = A (Cs-Cb).√ γ D, where γ is the rate of surface renewal, m is the mass of solid dissolved. Cs concentration of the solute.