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更新日期：2019-01-09
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°Rø:
The Rømer scale (Danish pronunciation: [ˈʁœːˀmɐ]; notated as °Rø), also known as Romer or Roemer, is a temperature scale named after the Danish astronomer Ole Christensen Rømer, who proposed it in 1701.
It is based on the freezing point of pure water being 7.5 degrees and the boiling point of water as 60 degrees.
Daniel Gabriel Fahrenheit, inventor of the Fahrenheit scale, learned of Rømer's work and visited him in 1708. Fahrenheit described how he borrowed the idea for his scale from this visit, but increased the number of divisions.
Newton published his scale in the same year as Rømer. Newton's system was calibrated between the freezing point of water (0 degrees) and human body temperature (12 degrees); it was a coarser scale, but unlike Rømer's it was not intended for everyday use, as Newton's interest was in determining the boiling points of metals, which are not readily accessible with Rømer's system based on liquid thermometers.
°R:
This article is about the temperature scale.
For the idealized thermodynamic cycle for a steam engine, see Rankine cycle.
For the scale measuring recovery after stroke, see Modified Rankin Scale.
"°R" redirects here.
The Rankine scale (/ˈræŋkɪn/) is an absolute scale of thermodynamic temperature named after the Glasgow University engineer and physicist William John Macquorn Rankine, who proposed it in 1859.
(The Kelvin scale was first proposed in 1848.) It may be used in engineering systems where heat computations are done using degrees Fahrenheit.
The symbol for degrees Rankine is °R (or °Ra if necessary to distinguish it from the Rømer and Réaumur scales).
By analogy with kelvin, some authors term the unit rankine, omitting the degree symbol.
Zero on both the Kelvin and Rankine scales is absolute zero, but a temperature difference of one Rankine degree is defined as equal to one Fahrenheit degree, rather than the Celsius degree used on the Kelvin scale.
Thus, a temperature of 0 K (−273.15 °C; −459.67 °F) is equal to 0 °R, and a temperature of −458.67 °F equal to 1 °R.
The US National Institute of Standards and Technology recommends against using the degree symbol when using Rankine in NIST publications.
By the way, to convert between Rankine and Rømer, you can use this application so easily. So if you need it, download and use it by now.
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