Question

A coin is dipped in molten wax kept in a glass tube. When we heat the upper part of the glass tube, the wax around the coin will not melt because:

• A. Wax has a very high melting point
• B. Wax is a good conductor of heat
• C. Glass is a good conductor of heat
• D. Wax and glass are bad conductors

Answer 1

The correct option is D Wax and glass are bad conductors

Glass is a bad conductor of heat hence the heat from the upper part of the glass tube will not transfer easily to the lower part. Having said that, even wax is a bad conductor of heat and won't melt easily.