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WHAT DOES THE SUN DO FOR US? Put equal amounts of ice in two glasses. Place one in the shade and one in the sunlight. Observe in which glass the ice melts more quickly. You will realize that the deciding factor is the heat from the sun. Obtain two small identical flasks. Coat one with candle soot or cover it with aluminum foil to prevent sunlight from entering. This is the experimental flask. Insert a thermometer into each of two one-hole stoppers, and place one in each flask. Set the flasks in a place that is shaded from direct sunlight until they are cool, then read and record their temperatures. Next set both flasks in the direct sunlight, and record the thermometer readings once a minute until the same readings appear at least three times in a row for each thermometer. The results can be plotted on a graph. You will readily realize that the sun's radiant energy easily enters the uncovered flask and is converted into heat energy that can be measured by the thermometer. The experimental flask remains cool because the radiant energy could not enter it. Make an analogy to the radiant energy that penetrates the earth's atmosphere, strikes the earth, and is converted into heat energy. As a supplementary activity, repeat the above procedure after covering the experimental flask with various materials such as colored cellophane or paint. You can also fill the experimental flask with various solid or liquid substances such as soil or water.  Any problems with this page? Send URL to
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