A group of students is investigating whether aluminum is a better thermal conductor than steel. The students take an aluminum wire and a steel wire of the same length and diameter. They put equal lengths of wax on one end of each wire and dip the other end into a beaker of hot water. The length of wax left on the wires after 10 minutes is shown. Experimental Observations Aluminum Steel Original length of wax 2.5 cm 2.5 cm Length of wax after 10 minutes 1.2 cm 1.8 cm Which step should the students take next