A glass test tube of water is heated at its top end. The water near the top boils, yet the water at the bottom does not warm up. Which row gives the explanation for the bottom of the test tube remaining cold?
- Aglass: good thermal conductor; water: good thermal conductor
- Bglass: good thermal conductor; water: poor thermal conductor
- Cglass: poor thermal conductor; water: good thermal conductor
- Dglass: poor thermal conductor; water: poor thermal conductor