Place the light source 10cm above the pouches. Turn the light on and record the temperature of each pouch each minute for 6 minutes. Repeat using the black paper. After about 6 readings, or whenever a difference in the temperature of 3 substances has been noted, the data collected should be analyzed and a determination made as to the comparative rate of heating of soil and water. The temperature of matter changes when the amount of heat in it changes.
Heat energy travels from a warmer to a cooler location.
A thermometer is used to measure the temperature of a substance. Much of radiant energy of the sun is changed into heat when it strikes objects. The black or dark colored materials and objects give off and take in heat the fastest. The radiant energy absorbed changes into heat. The lighter, white and shiny objects tend to reflect more of the sun's energy.