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No, a clinical thermometer does not need a magnet. You may be thinking of a Maximum/Minimum Thermometer which has a U-tube containing Mercury which expands and contracts as the temperature changes. Each arm of the U-tube contains mercury upon the upper surface of which are tiny floats made of steel (which floats on mercury) with tiny springs on their sides so that they grip the tube inside when the mercury does not move them any more. One of the floats records the highest temperature to which it was pushed, and the other indicates the coldest temperature to which it was pushed. So you are able to find out what the actual maximum and minimum temperatures were during the past 24 hours.

So why do we need a magnet? It's purpose is to attract the steel floats back to their positions just sitting on top of each mercury column.

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13y ago

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