How Does a Liquid in Glass Thermometer Work?

Answer

The liquid-in-glass thermometer is the most common kind of thermometer. It is a thin glass tube that has a small bulb at the end. This bulb is filled with a silver or red fluid, usually mercury. When the air around the thermometer becomes warm, the liquid swells up and pushes up the hollow glass tube. The scale on the thermometer will then tell us how high the liquid rises in degrees thus telling the temperature.
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