Chemical Process
Saponification value/number of an oil or fat is a measure of its

Fatty acid content
Average molecular weight
Degree of unsaturation of the fatty acids present in it
Insoluble fatty acid content

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Chemical Process
Liquefaction of gases can not be done by

Adiabatic expansion through a throttle valve (Joule-Thomson expansion)
Adiabatic expansion against a piston or in a turbine
Merely compressing it beyond critical pressure
Exchange of heat with colder stream

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