50 m³ 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 30 g m⁻³ at 30°C and 16 g m⁻³ at 20°C.

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Solution

$\begin{array}{l} We know that 1 m^{3} {of air contains 30 g of water vapour at 30}^{0} C . \\ {So, amount of water vapour in 50 m}^{3} {of air at 30}^{0} C = (30 \times 50) g=1500 g \\ Also, 1 m^{3} {of air contains 16 g of water vapour at 20}^{0} C . \\ {Amount of water vapour in 50 m}^{3} {of air at 20}^{0} C = (16 \times 50) g=800 g \\ Amount of water vapour condensed= (1500 - 800) g = 700 g \end{array}$

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50 m3 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 30 g m−3 at 30°C and 16 g m−3 at 20°C.

50 m³ 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 30 g m⁻³ at 30°C and 16 g m⁻³ at 20°C.