Learning about science and more specifically how water evaporation occurs can be achieved through activities and experiments at home. Children can see the water disappear in these experiments and learn how the evaporation happens. Water evaporation activities are educational opportunities. All of these activities can be performed using household items generally found in a home kitchen.
Covered Water Evaporation Activity
This evaporation activity uses two cups of water--one that is covered and one that is uncovered--to show over days that the water in the uncovered cup evaporates (disappears) and the water in the covered cup retains more water. To perform this activity you need two cups, a marker and a material to cover a cup, such as cellophane wrap, and water. Mark a fill line on the cups in the same place on both cups; fill the cups with water to the fill line. Cover one of the cups with the cellophane and leave the other uncovered. Each day observe how much water has evaporated from the cups and mark the levels of water on each cup. You will notice that the water level reduces in the cup that has no cover. This is when you explain to the kids how evaporation works.
Follow the Water Cycle
This activity shows the evaporation process. Have an adult heat ice cubes in a skillet and talk about the form the water is in when the cubes are put into skillet. Have the children watch from a safe distance as the ice cubes melt, and watch the water change from a solid to a liquid. The water then continues to heat up and eventually disappears and evaporates. As this process occurs, vapours and steam will rise as the water changes from a liquid to a gas. As the steam occurs, the kids can watch as condensation forms. This is called precipitation, which is what happens to the clouds when it rains. Have the children draw a picture of what evaporation or precipitation looks like.
Keeping Candy Cool Using Evaporation
A form of evaporation used to cool down food is demonstrated in this activity. For this project you will need two paper towels, water, two pieces of chocolate such as Hershey kisses, and a small lamp. First dip one paper towel in water and then ring out the excess water. Wrap one chocolate piece in the damp paper towel. Wrap the other chocolate piece in the dry paper towel. Place the two wrapped chocolate pieces at the base of a small lamp. Wait 10 minutes and then check to see which candy has melted. This will show how the piece of chocolate wrapped in the wet paper towel used evaporation to keep the chocolate cool and not melted. The piece in the dry towel will melt because it had no water to evaporate to keep cool.