A group of students is investigating whether copper is a better thermal conductor than steel. The students take a copper 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:
- Original length of wax
- Copper: 3 cm
- Steel: 3 cm
- Length of wax after 10 minutes
- Copper: 0.7 cm
- Steel: 1.8 cm
What was the dependent variable in this experiment?
a. Type of wire used
b. Original length of wire
c. Original length of wax
d. Thermal conductivity of wire
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