Take a cooled bottle of water from refrigerator and keep it on a table. After some time you notice a puddle of water around it. Why?

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Solution

The cooled water bottle has very cold exposed surface. Due to cool surface there is condensation of water-vapour from air on the surface of water bottle because water vapour is present in atmosphere. The condensed water molecules spread around the bottle. So a puddle of water is noticed after sometime.

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