Mass Transfer
Schimdt number and Lewis number for pure air at atmospheric conditions are respectively

1 and 0
0 and ≈ 1
< 1 and ≈ 1
>1 and ≈ 1

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Mass Transfer
Steam distillation is used to

Reduce the number of plates
Avoid thermal decomposition of a component
Increase the efficiency of separation
Increase the total pressure of distillation

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