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Mass Transfer - Engineering

Q1:

In case of an unsaturated mixture of gas and vapor, the percentage saturation is __________ its relative saturation.

A lower than

B higher than

C equal to

D either (a) or (b), depends on the mixture composition

ANS:A - lower than

In the case of an unsaturated mixture of gas and vapor: The percentage saturation is lower than its relative saturation. Percentage saturation is the ratio of the actual vapor pressure to the saturation vapor pressure at a given temperature, expressed as a percentage. Relative saturation is the ratio of the actual vapor pressure to the saturation vapor pressure at the same temperature, expressed as a fraction or decimal. In an unsaturated mixture, the actual vapor pressure is less than the saturation vapor pressure. Therefore, the percentage saturation (expressed as a percentage) will be lower than the relative saturation (expressed as a fraction or decimal), since it represents the actual vapor pressure as a fraction of the saturation vapor pressure.