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When a closed container containing liquid water is left for a time, two processes continually occur….?

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When a closed container containing liquid water is left for a time, two processes continually occur….?

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When you have water in a closed container, with an “air space” above the liquid, molecules of water contiuously leave the liquid phase for the gas phase. Concurrently molecules of water continuously leave the gas phase to rejoin the liquid phase. A dynamic equilibrium is established which means that the concentration of water in the gas phase becomes a constant. It will remain in this constant concentration condition, with molecules of water constantly moving between the liquid and gas phase as long as the conditions remain unchanged. An example of a changing condition would be if the temperture of the water/gas were to change. The equilibrium would adjust to suit the new condition. An increase in temperature will result in a higher concentration of water vapour in the gas phase. Your question can be answered as the two conditions are: vapourisation and condensation and at equilibtrium they occur at the same rate.

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