MEASURING ATMOSPHERIC PRESSURE#!#mm of Hg kya hota hai ??#!#FEEL THE PHYSICS !!

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The vapour pressure of water in at 20^(@)C is 12mm of Hg on a particular day the sturation vapour pressure of water at 20^(@)C is 17.5 mm of Hg Calculate relative humidity .

Vapour pressure of pure CS _ 2 and CH _ 3 COCH _ 3 are 512 mm of Hg and 312 mm of Hg respectively. Total vapour pressure of mixture is 600 mm of Hg then find incorrect statement :