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A '''thermometer''' is a device for measuring [[temperature]]. The two simplest ways to do this both rely on the principle that hot things expand and cold things contract. A liquid such as colored alcohol or mercury can be placed in an evacuated glass tube. The expansion and contraction of the liquid indicates the temperature, which can be read from a scale next to the expanded liquid. A helical spring can also be used, as in the common refrigerator thermometer. In such a refrigerator, the thermometer points at a scale.

A '''thermometer''' is a device for measuring [[temperature]]. The two simplest ways to do this both rely on the principle that hot things expand and cold things contract. A liquid such as colored alcohol or mercury can be placed in an evacuated glass tube. The expansion and contraction of the liquid indicates the temperature, which can be read from a scale next to the expanded liquid. A helical spring can also be used, as in the common refrigerator thermometer. In such a refrigerator, the thermometer points at a scale.

The first useful thermometer was invented in 1714 by [[Gabriel Fahrenheit]],<ref> [http://www.brannan.co.uk/thermometers/invention.html Who Invented the Thermometer?] </ref> who used mercury in a glass tube graduated with 180 degrees between the freezing and boiling points of water (32° F and 212° F). Modern scientists use the [[Celsius]] scale, graduated with 100 degrees between freezing and boiling (0° C to 100° C).

The first useful thermometer was invented in 1714 by [[Gabriel Fahrenheit]],<ref>[http://www.brannan.co.uk/thermometers/invention.html Who Invented the Thermometer?]</ref> who used mercury in a glass tube graduated with 180 degrees between the freezing and boiling points of water (32&nbsp;°F and 212&nbsp;°F). Modern scientists use the [[Celsius]] scale, graduated with 100 degrees between freezing and boiling (0&nbsp;°C to 100&nbsp;°C).

==Notes==

==Notes==

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[[category:Measurements]]

[[Category:Measurements]]