Nathan placed 1 cup of sand (S), potting soil, (P), and a mixture of sand and soil (M) into separate containers. In each of the
containers he placed a thermometer so that the bulb was 2.5 cm below the surface. He place the 3 containers under identical heat lamps for an hour. The original temperature of each container was 15C. After heating the jars in three separate trials, the temperatures of the containers were: