How Does Water Evaporate?

Answer

Water evaporates when it gains a little heat and the water molecules gain kinetic energy. Due to this absorption of energy, the hydrogen bonds connecting water molecules to one another will break. The molecules are now in the gaseous state; this is called water vapour. Evaporation is a process by which molecules in a liquid state spontaneously become gaseous.  
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1 Additional Answer
The evaporation of water only occurs at the surface which is why it doesn't need to boil to vaporize. Molecules of water spontaneously turn into a gas, which is how the water evaporates. You can find more information here: http://en.wikipedia.org/wiki/Evaporation
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