A teacher shows a class an experiment. A boiling tube is partly filled with water, and a few ice cubes are held at the base of the tube. The teacher then heats the boiling tube in the arrangement shown until the water at the top reaches boiling point. The ice remains unmelted. What does this show?
- AWater is a good conductor of thermal energy.
- BWater is a good convection of thermal energy.
- CWater is a poor conductor of thermal energy.
- DWater is a poor convection of thermal energy.