`50m^(3)` of saturated vapour is cooled down from `30^(@)C`to `20^(@)C.Find the mass of the water condensed. The absolute humidity of saturated water vapour is `30g m^(-3)`at `30^(@)C`and `16g m^(-3) at 20^(@)C`.

Explanation

` 50 cm^3` of saturated vapour is cooled from
` 30^@ to 20^@.` The absolute humidity of
saturated `(H_2)O` vapour `30 g // m^3.` Absolute
humidity is the mass of water vapour
present in a given volume. AT ` 30^@C` it
contains `30 g // m^3` .
at ` 50 m^3` it contains 30 xx 50 = 1500g
` at 20^@C it contains 16 xx 50 = 800g `
` water condense = 1500 - 800 = 700 gm`