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Consider a thick glass tumbler and a thin glass tumbler which are made of the sa...


Question

Consider a thick glass tumbler and a thin glass tumbler which are made of the same kind of glass. Some hot liquid is poured into them. Which of the following statements is correct?

Options

A) the thick tumbler is less likely to crack because it is stronger

B) the thick tumbler is less likely to crack because it insulates the heat beter, glass being a poor conductor of heat

C) Both tumblers are equally likely to crack because they are made of the same kind of glass

D) the thick tumbler is more likely to crack because uneven expansion persists for a longer time within the thicker glass

E) the thick tumbler is more likely to crack because it is heavier


The correct answer is C.


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Dicussion (1)

  • The correct answer is D not C.✅
    Class cracks with temperature changes because it is a bad thermal conductor. This means that if one part of glass gets warm quickly, this heat will not move though the glass very quickly. When a most substances are heated they expand.

    When thick glass placed in hot water, the surface warms first and expands. The deeper glass doesn't get warmed as quickly and doesn't expand as much. When one part of the glass expands more than another, it creates stress in the glass. When this stress exceeds the strength of the glass, it cracks.

    Thin glass behaves the same way, but less stress develops because the glass stays closer to the same temperature.

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