Mass Transfer
Critical humidity of a solid salt means the humidity

Above which it will always become damp
Below which it will always stay dry
Above Which it will always become dry and below which it will always stay damp
Both A and B

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Mass Transfer
Bollman extractor

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

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