Chemical Engineering Thermodynamics
The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of __________ and COP are the same.

Work
Temperature
Kinematic viscosity
None of these

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Chemical Engineering Thermodynamics
The necessary and sufficient condition for equilibrium between two phases is

The chemical potential of each component should be same in the two phases
The concentration of each component should be same in the two phases
The pressure should be same in the two phases
The temperature of each phase should be same

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