Suggest an experiment to prove that rate of evaporation of a liquid depends on its surface area and vapour already prevent in surrounding air.
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Explanation:
i) Take a cup full of water and then take a plate filled with water. Put both of them under direct sunlight ( or in open air) . Then note the time taken by water in both cup and plate to evaporate .
You'll see the water in plate will evaporate lot faster than that in the cup.
ii) Now for observing the affect of (concentration of) vapours in surrounding air , take two cups of water . Then cover one of them with a large (glass )bowl . You will notice that the one that isn't covered will have higher rate of evaporation (the water level will fall earlier than in the other one.While, in the other one the vapours start accumulating in the bowl and therefore the rate off evaporation falls.
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