Celsius
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Temperature in degrees Celsius (or Centigrade)
Proposed (in a slightly different form) in 1742 by Swedish astronomer Anders Celsius.
In 1948 officially renamed from Centigrade.
The freezing point of water is 0 °C, the boiling point is 100 °C
and absolute zero is at -273.15 °C.
One degree Celsius equals one kelvin.
Standard abbreviation is °C
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Centigrade
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Temperature in degrees Centigrade (or Celsius)
Proposed (in a slightly different form) in 1742 by Swedish astronomer Anders Celsius.
In 1948 Centigrade was officially renamed to Celsius.
The freezing point of water is 0 °C, the boiling point is 100 °C
and absolute zero is at -273.15 °C.
One degree Centigrade equals one kelvin.
Standard abbreviation is °C
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Delisle
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Temperature in degrees Delisle
Invented in 1732 by French astronomer Joseph-Nicolas Delisle.
It is similar to that of Réaumur.
The freezing point of water is 150 °De, and the boiling point is 0 °De
and absolute zero is at 559.725 °De.
One degree Delisle equals −2/3 of a kelvin or degree Celsius.
Standard abbreviation is °De
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Fahrenheit
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Temperature in degrees Fahrenheit
Proposed in 1708 by German physicist Gabriel Fahrenheit.
The freezing point of water is 32 °F, the boiling point is 212 °F
and absolute zero is -459.67 °F.
One degree Fahrenheit equals 5/9th of a kelvin or degree Celsius.
Standard abbreviation is °F
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kelvin
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Temperature in kelvin units
Introduced in 1954 as the SI unit of temperature.
Named after William Thomson, 1st Baron Kelvin.
The freezing point of water is 273.15 K, the boiling point is 373.15 K
and absolute zero (when molecular motion stops) is 0 K.
One kelvin is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water.
One kelvin equals one degree Celsius.
Standard abbreviation is K
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Newton
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Temperature in degrees Newton
Proposed around 1700 by Isaac Newton.
The freezing point of water is 0 °N, the boiling point is 33 °N
and absolute zero is -90.1395 °N.
1 degree Newton equals 100/33rd of a kelvin or a degree Celcius.
Standard abbreviation is °N
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Rankine
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Temperature in degrees Rankine
Proposed in 1859 by Scottish engineer and physicist William John Macquorn Rankine.
The freezing point of water is 491.67 °R, the boiling point is 671.67 °R
and absolute zero is 0 °R.
One degree Rankine equals one degree Fahrenheit.
Standard abbreviation is °R
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Reaumur
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Temperature in degrees Réaumur
Proposed in 1731 by René Antoine Ferchault de Réaumur.
Also known as the "division octogesimale" or "octogesimal division".
The freezing point of water is 0 °Ré, the boiling point 80 °Ré
and absolute zero is -218.52 °Ré.
One degree Reaumur is 1.25 degrees Celsius or kelvins.
Standard abbreviation is °R, but °Ré allows unique identification
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Romer
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Temperature in degrees Rømer
Proposed in 1701 by Danish astronomer Ole Christensen Rømer.
The freezing point of water is 7.5 °Rø, the boiling point 60 °Rø
and absolute zero is -135.9038 °Rø.
One degree Rømer equals 40/21st of a kelvin or degree Celsius.
Standard abbreviation is °R, but °Rø allows unique identification
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