Difference between revisions of "Thermometer"

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(ref: Who Invented the Thermometer?)
(centigrade is, technically, not the same as Celsius - but it's close enough for weather reports)
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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. A helical spring can also be used, is in the common refrigerator thermometer.
 
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]],<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 centigrade thermometer, graduated with 100 degrees between freezing and boiling (0° C to 100° C).
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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]] thermometer, graduated with 100 degrees between freezing and boiling (0° C to 100° C).
  
 
==Notes==
 
==Notes==
 
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Revision as of 07:57, 11 March 2008

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,[1] 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 thermometer, graduated with 100 degrees between freezing and boiling (0° C to 100° C).

Notes