Question

If you have a glass of ice water outside on a hot day, sometimes people say the glass is sweating. What is really happening to the glass of water?

Answer 1

Condensation forms on the surface of a glass of ice water kept in open air because the temperature of the nearby air is reduced to below the dew point.The air cannot hold as much water as it did at room temperature , and so water condenses. Energy is released when the water condenses, speeding the melting of the ice in the glass.