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更新日期：2019-01-05
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°C:
Celsius is the temperature scale previously known as the centigrade scale.
The name Centigrade was derived from the Latin - meaning "hundred degrees".
When Anders Celsius - a Swedish astronomer - created his original scale in 1742 he inexplicably chose 0° for the boiling point and 100° for the freezing point.
One year later Frenchman Jean Pierre Cristin proposed an inverted version of the scale - freezing point 0°, boiling point 100°.
He named it Centigrade.
In 1948, by international agreement, Cristin's adapted scale became known as Celsius to honour the Swedish Scientist.
The degree Celsius - symbol: °C - can refer to a specific temperature on the Celsius scale as well as serve as unit increment to indicate a temperature interval.
°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.
Some important temperatures relating the Rankine scale to other temperature scales are shown in the table below.
By the way, to convert between Celsius and Rankine, you can use this application so easily. So if you need it, download and use it by now.
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