Mass Transfer
In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is

Equal to the heat of wetting
Zero
Called integral heat of adsorption
Equal to the heat of formation of surface compound

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Mass Transfer
Blowdown in a cooling tower

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

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