Question

suggest an experiment to prove that the rate of evaporation of a liquid depends on its surface area and vapour already present in surroundings air

Answer 1

take a wide mouthed bowl.and fill it with water.and take another glass of water which is thin mouthed.keep both of them under the rotating fan in ur house r in sunlight.then u will observe that rate of evaporation is more in wide mounted bowl than is less mouthed glass.

Answer 2

Answer:

is there you answer

Explanation:

To experimentally prove that the rate of evaporation depends on vapour present in the surrounding air-

Experiment:

 (i) Take equal amounts of water in a cup as well as in a dish.

(ii) When left for some time, it is observed that the water in the dish disappears while some water is still left in the cup.

(iii) This is so because the evaporation is a surface phenomenon, so it depends on the surface area which is more in case of the dish as compared to the cup.

(iv) So, in the dish, the surface of the water which is exposed to air is more than in the cup.

(v) This proves that as the surface area exposed increases, the rate of evaporation also tends to increase.

(vi) The same experiment is now conducted on a humid day.

(vii) It is noticed that it takes more time to evaporate on a humid day because the water present in the air is more on a humid day than on a normal day. So, the water molecules which are escaping from the surface of the dish collide with water molecules already present in the air.

(viii) So, after the collision, they return back to the dish which reduces the rate of evaporation.

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