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27 April, 17:13

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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Answers (1)
  1. 27 April, 17:37
    0
    The dependent variable is clearly the original length of wax because the amount the wax melted determined which type of metal was a better heat conductor. The best heat conductor was steel because it held heat for longer thus making the wax continue to melt for longer than the steel wire resulting in a longer piece of melted wax left on the wire.
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