Mass Transfer
Relative humidity is the ratio of the

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

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Mass Transfer
Bollman extractor

Is used for extraction of oil from oilseed
Is a static bed leaching equipment
Employs only counter-current extraction
Is a centrifugal extractor

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