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How much mercury is in a thermometer?

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The amount of mercury present in a thermometer is very small. According to NHS, a typical thermometer that is used to measure body temperature contains not more than 3 grams of mercury.The typical fever thermometer contains 0.5 to 3 grams of elemental mercury. read more

In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked on the tube. With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale. Mercury thermometers can be used to determine body, liquid, and vapor temperature. read more

The mercury-in-glass or mercury thermometer was invented by physicist Daniel Gabriel Fahrenheit in Amsterdam (1714). It consists of a bulb containing mercury attached to a glass tube of narrow diameter; the volume of mercury in the tube is much less than the volume in the bulb. read more

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