Mass Transfer
Humid volume is the total volume in m³ of 1 kg of

Vapour laden gas at 1 atm. and gas temperature
Vapour laden gas at 1 atm. and room temperature
Gas plus its accompanying vapour at 1 atm. and gas temperature
Gas plus its accompanying vapour at 1 atm. and room temperature

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Mass Transfer
Priming in a distillation column

Is characterised by the presence of foam throughout the space between trays
Reduces the overall pressure drop
Is desirable from point efficiency consideration
Results from very low gas velocity

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