A thick walled glass tumbler sometimes cracks when boiling water is poured into it. Why? .Give reason.
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When boiling water is poured into a thick tumbler its inner surface expands. However, due to low thermal conductivity of glass, the expansion of outer surface of the tumbler is quite small. Due to uneven expansion of the outer and inner surfaces, the tumbler breaks.
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A thick glass tumbler cracks when hot water is poured into it because of uneven expansion of the walls.
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