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invented in 1714 by Gabriel Fahrenheit, who used mercury in a glass tube
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. A helical spring can also be used, is in the common refrigerator thermometer.
The first useful thermometer was invented in 1714 by [[Gabriel Fahrenheit]], 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 centigrade thermometer, graduated with 100 degrees between freezing and boiling (0° C to 100° C).
The first useful thermometer was invented in 1714 by [[Gabriel Fahrenheit]], 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 centigrade thermometer, graduated with 100 degrees between freezing and boiling (0° C to 100° C).