Water droplets form on the outside of the tumbler due to condensation. The cold surface of the tumbler cools the humid air around it, causing water vapor to condense into droplets on the exterior.
Chapter 8 A Journey through States on Water
Class VI NCERT Book Curiosity Science
Why do water droplets form on the outside of a glass tumbler filled with ice-cold water?
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Water droplets form on the outside of a glass tumbler filled with ice-cold water due to condensation. Warm, moist air around the glass cools upon contact, causing the water vapor in the air to condense into droplets.
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