Compared to non-metals, which of the following is true about coefficient of linear expansion (αl) of metals?
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A.
Metals have same value of αl
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B.
Metals have relatively smaller value of αl
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C.
Metals have relatively higher value of αl
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D.
The value of αl is zero for all metals
Correct Answer:
C. Metals have relatively higher value of αl
Explanation:
The coefficient of linear expansion (αl) measures how much a material's length increases per degree of temperature change. Metals generally have significantly higher coefficients of linear expansion compared to non-metals because their atomic structures allow for greater vibrational movement when heated. This higher thermal sensitivity means that metals expand and contract more noticeably than most non-metallic materials, such as ceramics or glass, when subjected to the same temperature fluctuations. Therefore, the correct observation is that metals possess a relatively higher value of αl.
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