Water evaporates when molecules at the interface of water and air have enough energy to escape the forces that hold them together in the liquid. Evaporation, along with boiling, is a type of vaporization. More »

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Water evaporates because individual water molecules break free of the bonds that hold them all together as a liquid. While water evaporates more in heat, it is possible for it to evaporate in cold conditions. More »

Although the rate at which water evaporates varies depending on temperature, humidity, wind speed and other factors, the average swimming pool loses about 1/4 inch of water per day. Direct sunlight also speeds the rate o... More »

Water evaporates because individual water molecules break free of the bonds that hold them all together as a liquid. While water evaporates more in heat, it is possible for it to evaporate in cold conditions. More »

Energy is required to boil a liquid in order to give the molecules enough energy to overcome intermolecular attraction forces. While boiling, the highest energy liquid molecules are able to escape the liquid and enter th... More »

Water freezing into ice is a physical change because the hydrogen and oxygen molecules that make up the water stay the same, despite the change in state from liquid to solid. A physical change is simply a change in the m... More »

Water boils when the thermal energy in the water, which is a type of kinetic energy which causes the water molecules to move around, exceeds the strength of the hydrogen bonds between the molecules, causing them to separ... More »