Mass Transfer
Molecular diffusion is caused by the

Activation energy of the molecules
Thermal energy of the molecules
Potential energy of the molecules
Transfer of molecules from low concentration to high concentration region

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Mass Transfer
Blowdown in a cooling tower

Increases the scale forming tendencies of water
Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities
Is undesirable
All of these

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