水蒸發的問題

boiling point of water is 100 degree when evaporating point is 0 degree.

when a glass of cool water placed under room temperature, the temp. of water is lower than the surroundings, so the water will gain heat from the surroundings. When the water molecules on the water surface gained enough energy, they will escape from the water to become gas.Just like the hot water at 100 degree, the water molecules have enough energy to escape from the water, so it evaporates. The difference of the evaporation between the boiled water and cool water is the rate. As the boiling water get energy in a faster rate, so it evaporates faster.

水無時無刻都會蒸發...不過分別係蒸發的速度