A glass test-tube containing water is heated at the top. The water at the top boils, but the water at the bottom remains cold.
Which row explains why the water at the bottom of the test-tube remains cold?
1 )
glass:good thermal conductor / water:good thermal conductor
2 )
glass:good thermal conductor / water:poor thermal conductor
3 )
glass:poor thermal conductor / water:good thermal conductor
glass:poor thermal conductor / water:poor thermal conductor
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