What will be the relative humidity of air
whose absolute humidity is 20 gm/m' and
vapour holding capacity is 30 gm/m"?
Answers
Explanation:
The absolute humidity is measured in number of kg of water vapour in a cubic metre of air (kg/m^3). The relative humidity (RH) is expressed as (partial pressure of water vapour)/(partial pressure of water vapour if the air is saturated). But there is another definition that is used and it is (Mass of water vapour in a parcel)/(mass of water vapour in the parcel if the air is saturated). The second definition is most confusing, because if the parcel becomes saturated it is no longer the same parcel. If you add water vapour the volume becomes greater. A better definition of RH is (mass of water vapour in volume V of a parcel)/(mass of water vapour in volume V of a parcel if the air is saturated). These definitions assume that the temperature remains the same. Another definition of RH that overcomes the problem of taking the same volume is this: RH is the ratio of the water vapour density (mass per unit volume) to the saturation water vapour density (mass per unit volume if the air is saturated), expressed in percent. So absolute humidity will give you mass per unit volume and RH will give mass per mass. In fact, water vapour density mentioned in the last definition is absolute humidity. One can show, using gas laws, that all the definitions above give the same answer for the RH.
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