Mass Transfer
In physical terms, Schmidt number means

Momentum diffusivity/mass diffusivity
Mass diffusivity/thermal diffusivity
Thermal diffusivity/mass diffusivity
Thermal diffusivity/momentum diffusivity

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Mass Transfer
If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution temperature (CST or consolute temperature). If solubilities increase with decrease in temperature, then CST is the temperature below which they dissolve completely. If a binary system has no critical solution temperature, it implies that

The system comprises of partially mis-cible liquids
The system comprises of an azeotrope
The system comprises of miscible liquids
On heating, a vapor phase will appear ; while on cooling, a solid phase will appear

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Mass Transfer
The wetted wall tower is used to determine

M.T.C. of individual components in a liquid-liquid system
The overall M.T.C. of the system
M.T.C. of liquid in liquid-gas system
Individual mass transfer co-efficient (M.T.C.) in gaseous system

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

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

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