Question

A thick glass tumbler cracks when hot water is poured into it.

• A. True
• B. False

Answer 1

The correct option is A True

1. When boiling water is poured into a thick tumbler its inner surface expands
2. However, due to the low thermal conductivity of glass, the expansion of the outer surface of the tumbler is quite small. Due to uneven expansion of the outer and inner surfaces, the tumbler breaks
3. Still, special glass such as Pyrex does not break because there is no appreciable uneven expansion between their inner and outer surfaces.

Hence, the statement ‘A thick glass tumbler cracks when hot water is poured into’ is True.