Question

Give reasons for the following statement.

A normal glass tumbler cracks when dipped in boiling water.

Answer 1

1. When the glass tumbler is sipped in boiling water the outer surface of the glass expands because it comes in contact with the hot water.
2. But, the expansion of the inner surface of the glass is quite small due to the low thermal conductivity of the glass.
3. Due to the uneven expansion of the outer and inner surface, the glass tumbler breaks.
   Hence, a normal glass tumbler cracks when dipped in boiling water.