At 20°C, the vapour pressure of water is recorded as 22.57 mbar. What will be vapour pressure of water in the apparatus shown after the piston is lowered, thereby decreasing the volume of the gas abov

Question

At 20°C, the vapour pressure of water is recorded as 22.57 mbar. What will be vapour pressure of water in the apparatus shown after the piston is lowered, thereby decreasing the volume of the gas above liquid to half of the original volume

Prashant Kotian · Accepted Answer

Correct answer: B. Vapour pressure of a liquid depends only on temperature, not on the volume of the container or the gaseous space above the liquid . Thus, it remains unchanged at 22.57 mbar .

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