Mass Transfer
In the constant rate period of the rate of drying curve for batch drying,

Rate of drying decreases abruptly
None of these
Surface evaporation of unbound moisture occurs
Cracks develop on the surface of the solid

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Mass Transfer
If a two phase system is in physical equilibrium; then it means that, the

Temperature of the liquid phase is equal to that of the vapor phase
Total pressure throughout the liquid phase is equal to that throughout the vapor phase
Escaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase
All of these

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