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Apparatus: Two aluminium tins of the sam...

Apparatus: Two aluminium tins of the same size, two small galsses, water, thermometers, black paint, etc. :
Procedure: Paint the outer surface of one tin black paint, and let it dry. Then in both tins, place one glass, each filled with water at the same temperature. cover the tins with lids. Keep them in the sun for two hours. Now measure the temperature of the water in the glasses in the two tins. What is the reason for the difference in the temperature?

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