A thick tumbler and a thin tumbler of glass are filled with hot water. The thick tumbler cracks but not the thin tumbler. Why?

A thick tumbler and a thin tumbler of glass are filled with hot water.

1.	A thick tumbler and a thin tumbler of glass are filled with hot water. The thick tumbler cracks but not the thin tumbler. Why?
Answer» Solution :The THICK tumbler cracks due to uneven EXPANSION of its inner and OUTER SURFACES whereas the thin tumbler does not crack due to uniform expansion of its inner and outer surfaces.