A teacher shows a class an experiment. A boiling tube contains water, and some ice cubes are held at the base of the tube. The teacher then heats the boiling tube in the position shown until the water at the top starts boiling. The ice does not melt. What does this show?
- AWater is a good conductor of thermal energy.
- BWater is a good convector of thermal energy.
- CWater is a poor conductor of thermal energy.
- DWater is a poor convector of thermal energy.