Why does the liquid in a thermometer rise on a hot day and drop down

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Why does the liquid in a thermometer rise on a hot day and drop down on a cold day?this question is part of science  heat test

John Smith · Accepted Answer

On a hot day, the particles in the liquid move fast and take up more space.  On a cold day the particles in the liquid move slowly and take up less space.

Why does the liquid in a thermometer rise on a hot day and drop down on a cold day?

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