Heat Transfer
In an interphase heat transfer process, the equilibrium state corresponds to equality of temperature in the two phases, while the condition for equilibrium in an interphase mass transfer process is equality of

Mass transfer co-efficients
Chemical potentials
Concentrations
Activity co-efficients

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Heat Transfer
In sub-cooled boiling,

Temperature of the heating surface is more than the boiling point of the liquid
Temperature of the heating surface is less than the boiling point of the liquid
Bubbles from heating surface are absorbed by the mass of the liquid
Very large vapour space is necessary

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