Water inside the bag heats up and turns into vapour. The vapour cools and forms droplets on the inner cover. This shows evaporation and condensation, just like in the real water cycle.
Class 5 NCERT EVS Our Wondrous World Chapter 1 Water-The Essence of Life solutions
Class 5 EVS Textbook Our Wondrous World Chapter 1 Water–The Essence of Life question answer
In the sealed plastic bag, coloured water heats up from sunlight and turns into vapour. This vapour rises, cools and forms small droplets on the inner side of the plastic—showing condensation. These droplets eventually fall, showing precipitation. This activity models the water cycle with evaporation, condensation and rainfall inside a bag. It helps us understand how weather forms and water moves in nature.
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