it is a liquid inside the thermometer that uses when hot and goes down when it is cold
need kopo ulet to thanks po sa makaka sagot maayos po pleas
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Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer. It also has a high boiling point which makes it very suitable to measure higher temperatures.