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What is called the ratio of partial pressure of vapor and partial pressure of the dry gas?

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What is called the ratio of partial pressure of vapor and partial pressure of the dry gas?

(a) Humidity

(b) Relative humidity

(c) Molal humidity

(d) None of the mentioned

This question was addressed to me in a job interview.

Enquiry is from Partial Saturation Terminology topic in division Two Phase Gas – Liquid Systems, Phase Rule and Vapor-Liquid Equilibria of Basic Chemical Engineering

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The correct option is (c) Molal humidity

The explanation is: Partial pressure of vapor divided by the partial pressure of vapor free gas is called molal humidity.

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