Question
Pieces of iron and glass are heated to same temperature. Why does the piece of iron appear hotter than glass on touching?
Solution
The thermal conductivity of copper is about 400 times greater than that of glass. That is, the heat flowing through the copper moves about 400 times faster than it moves through the glass.
And the glass holds it's heat longer resulting in the slow transfer of heat to the skin.
Therefore, the piece of iron appear hotter than glass on touching.
