Relative humidity id defind as the ration of partial pressure of water in air at a given temperature to the vapour pressure of water at that that temperature Calculate the mass of water per litre air at
(a) `20^(@)C` and `45%` relative humidity
(b) `0^(@)C` and `95%` relative humidity
(c ) Discuss wether temperature or relative humidity has the greater effect on the mass of water vapour in air Given `P_(H_(2)O)^(@) =17.5` torr at `20^(@)C` and 4.58 torr `0^(@)C` .