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Because the thermal expansion is higher from alcohol (ethanol) and then it's more precise.

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14y ago

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Why do schools generally use red alcohol thermometers and not mercury?

Alcohol also reacts to heat by expanding and contracting and is much safer to use than mercury which is a neurotoxin that can make you very sick if the thermometer were to break and you got in contact with it.


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Mercury is a toxic substance that can be harmful if the thermometer breaks and the mercury is released. In schools, there is a risk of accidental breakage and exposure to students and staff. As a result, schools have shifted to using safer alternatives like digital thermometers.


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