Question

why do we see water droplets that was collected in the outer surface of glass water

Answer 1

When water vapour in the air comes into contact with something cool, such as the outside of a cold glass of lemonade, its molecules slow down and get closer together. When that happens, the gaseous water vapour turns back into liquid water droplets. That's condensation.

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Answer 2

Bcz the water vapour present in the air condenses and loses its energy when it comes in contact with the glass and they stick on the surface of glass.