Ravi placed two identical glasses of water, A and B, in a room. Glass A was covered with a lid while Glass B was left open. After two days, Glass B had less water than Glass A. Why?
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Worked Solution
Step 1: Evaporation occurs in both glasses. In Glass B, the water vapour escapes into the air.
Step [2-9]: In Glass A, the water vapour hits the lid, loses heat, and condenses back into liquid droplets.
Step [2-9]: These droplets fall back into the glass, so the water level remains almost the same in A.
Correct answer: The water in Glass A condensed and fell back into the glass.
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