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प्रश्न
Why is mercury used in glass thermometers?
पर्याय
It has a very low α value
It is a solid at room temperature
It has a high α value, so it expands noticeably with small temperature changes
It does not expand on heating
MCQ
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उत्तर
It has a high α value, so it expands noticeably with small temperature changes
Explanation:
Mercury has α = 6.1 × 10⁻⁵ K⁻¹, which is much higher than most solids. This large expansion makes temperature changes easy to read on a scale.
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