A teacher adds some cold water to a test-tube. She grips the lower end of the test-tube while heating the upper end. The water near the top comes to the boil, yet she keeps holding the test-tube because the lower part stays cold. What conclusion about water can be drawn from this experiment?
- AWater is a bad conductor.
- BWater is a bad convector.
- CWater is a good conductor.
- DWater is a good convector.