Mass Transfer
Inside the distillation column, the

Pressure increases gradually from bottom to the top of the column
None of these
Driving force for the vapour flow is the pressure drop
Liquids are not always at their bubble points

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Mass Transfer
An example of elutioh is

Dissolution of tannin out of tree barks by water
Recovery of vegetable oils from seeds
Separation of sugar from sugar beet by hot water
Separation of uranium oxide from its ore by H₂SO₄ in a Pachuca tank

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