Mass Transfer
Blowdown in a cooling tower

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

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Mass Transfer
Relative humidity is the ratio of the

Partial pressure of the vapour to the vapour pressure of the liquid at room temperature
Actual humidity to saturation humidity
None of these
Partial pressure of the vapour to the vapour pressure of the liquid at gas temperature

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