Question

1. Why does an ordinary glass tumbler crack if hot water is poured into it?​

Answer 1

Answer:

A thick glass tumbler cracks when hot water is poured into it because of uneven expansion of the walls. ... When the surface of glass comes in contact with hot water, it expands as per its coefficient of thermal expansion

Explanation:

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Answer 2

Answer:

When hot water is poured into thick glass tumbler, the inner surface of the tumbler becomes hot and expands. The outer surface of the tumbler does not expand quickly. Due to this uneven expansion, the glass tumbler cracks.