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Probably because the meter stick is not accurate enough to measure the small amount of expansion of the rod. You need something smaller and more accurate.

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βˆ™ 12y ago
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βˆ™ 5mo ago

A meter stick is not precise enough for measuring small changes in length due to thermal expansion. For accurate measurements of expansion, a more sensitive instrument like a micrometer or vernier caliper is required.

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Q: Why couldn't a meter stick be used to measure expansion of the rod?
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