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The temperature and the relative humidity of air are 20C and 80% on a certain day. Find the fraction of the mass of water

The temperature and the relative humidity of air are 20C and 80% on a certain day. Find the fraction of the mass of water vapour that will condense if the temperature falls to 5C. Saturation vapour pressures at 20C and 5C are 17.5 mm and 65 mm of mercury respectively.

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