A liquid thermometer is a device consisting of a small glass flask with a thin glass tube from which air is evacuated. A liquid (for example alcohol) is poured into the flask. The device is hermetically sealed and has a graduated scale. The principle of operation of this device is based on the fact that liquids expand when heated. However, studies have shown that different liquids expand differently when heated at the same temperature. Therefore, thermometers filled with different liquids, when the readings coincide at 0C and 100C, can give different readings at intermediate temperatures.
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