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Question 9

During summer, Boojho carries water in a transparent plastic bottle to his school. One day he left his bottle in the school. The bottle still had some water left in it. The following day, he observed some water droplets on the inner surface of the empty portion of the bottle. These droplets of water were formed due to

(a) Boiling and condensation.

(b) Evaporation and saturation.

(c) Evaporation and condensation.

(d) Condensation and saturation.

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Solution

Since it is summer and also that the water bottle is transparent, a small mass of water would have evaporated and then got condensed at the walls of the bottle forming the water droplets. The process of conversion of water vapour into liquid form is called condensation and the process of conversion from liquid into vapour is called as evaporation. So, the droplets of water on the inner surface of the bottle were formed due to evaporation and condensation.


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