It is desired to dry a product whose shape is cubic 25 mm and 25 mm in length using a stream of air flowing over it The equilibrium humidity with the drying air is 3% wet basis After 9 hours of drying the moisture content has decreased from 35% to 10%. wet base. Assume that the convective coefficient of mass transfer is large enough so that the relative resistance is zero. Determine. a. effective diffusivity b. The moisture content of the sample when all faces are exposed to drying air