50 m of saturated vapour is cooled down from $30^{0}$ C to $20^{0}$ C. Find the mass of the water condensed. The absolute humidity of saturated water vapour is 30 $g m^{- 3}$ a at $30^{0}$ C and 16 $g m^{- 3}$ at $20^{0}$ C.

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Solution

50 $c m^{3}$ of saturated vapour is cooled down from $30^{0}$ to $20^{0}$ . 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 $30^{0}$ C it contains 30 $g / m^{3}$ at 50 $m^{3}$ it contains 30 $\times$ 50 = 1500 g at $20^{0}$ C it contains 16 $\times$ 50 = 800 g water condense = 1500-800 = 700 gm

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