Mass Transfer
For the same feed, feed quality and separation (in a distillation column), with the increase of total pressure, the number of ideal plates will

Remain same
Increase
Data insufficient, can't be predicted
Decrease

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Mass Transfer
In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because

Saturated steam is used for steam distillation
Temperature is less
Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition
Total pressure is less

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