Vapour is injected at a uniform rate in a closed vessel which was initially evacuated. The pressure in the vessel

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first increases and then becomes constant. As the vapour is injected, the pressure of the chamber increases. But when the pressure becomes equal to the saturated vapour pressure, it condenses. So, if more vapour is injected beyond the saturated vapour pressure, the vapour will condense and thus the vapour pressure will be constant.

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