Mass Transfer
In case of unsaturated air

None of the listed here
Wet bulb temperature < dry bulb temperature
Dew point < wet bulb temperature
Both of the options given here

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Mass Transfer
A coalescer in a mixer-settler liquid-liquid extraction coloumn

All of these
Comprises of thin bed of substances of extended surface having high porosity
Helps in increasing the bubble size entering the settler
Helps in increasing the settling rate of the bubbles

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