what is isotherm and what substances used in thermometer tube
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Isotherm, line drawn on a map or chart joining points with the same temperature. Isothermsare commonly used in meteorology to show the distribution of temperature at the Earth's surface or on a chart indicating constant level or constant pressure.
Mercury is one of the most familiar materials used in liquid thermometers. Other liquids, such as kerosene or ethanol, may also be used in these types of thermometers. When heat rises, the liquid expands from a bowl or bulb into the empty area, climbing up the tube.
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