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Energy from the Sun
Materials 1. 3 used cans with the labels removed 2. White water-based paint 3. Black water-based paint 4. Brushes 5. Thermometer
Directions Paint the outside of two of the cans one with white paint, one with black paint. Fill each can with the same amount of water (use a measuring cup) from the faucet. Place the cans on a sunny window ledge or in the sun somewhere. Let them sit for about three hours. Now take the temperature of the water in each can. Which can has the warmest water? Why was this so? Explain to your child the principle of solar energy and its benefits.
Directions Partly fill the plastic cups with water so that they both have the same level of water. Mark the levels with the marker. Seal one of the cups with plastic wrap. Leave it for a day. Look at both cups and mark where the water levels are. Do this for a few more days, marking the levels each day and noting any change. Your child will notice that the water level goes down in the cup that has no cover. Where does the water go? Talk about the water disappearing and explain what evaporation is.