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To see for yourself what happens when water evaporates! For this project, you will need only a glass beaker and a sunny window, but you will learn why evaporation is an important part of the water cycle.
*You could also use a tall glass if you don't have a beaker.
The water in the beaker seems to disappear the longer you leave it in the sun. This is not a magic trick. It's science! As the sun heated up the water in the cup, some of the water evaporated into a gas called water vapor. You can't see water vapor, but you can tell that the water has changed from a liquid to a gas because there is less liquid in the cup. Right before it rains there is water vapor inside clouds. When the weather is right the water vapor will come together and form raindrops. When the water vapor starts forming tiny drops of water we call it condensation. When condensation falls to earth as rain we call it precipitation. Sometimes the droplets freeze before they get to the ground and become hail, sleet, or snow!