Why on hot days the mercury inside a thermometer moves up and on cooler days it moves downs

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asked Nov 14, 2019 173k views

1 Answer

Kevin Wheeler · Answer 1 · 2019-11-20T20:05:06+0000

When it is hot, the heat causes the mercury inside the thermometer to expand, and so that is why it moves UP.
However, when it's cold, the cold causes the mercury inside the thermometer to contract, and so that is why it moves DOWN.

Why on hot days the mercury inside a thermometer moves up and on cooler days it moves downs

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