In each disc punch a hole large enough to insert a thermometer. Fill the two jars with water. Take the temperature of each jar. Then place the two jars in the sunlight. The jar of water wrapped in black paper was heated the fastest.
Black objects are the best heat absorbers.
This is the reason why black or dark colored clothes make you feel warm on a hot day. The jar of water wrapped in aluminum foil was heated the slowest. Light-colored, shiny objects reflect more of the sun's light and heat. Yes, that is why wearing white clothes in the summer makes you feel cooler. To understand the water cycle, do the following experiment.