Rankine

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**Degrees Rankine temperature conversion formulas**
Conversion from	to	Formula
degrees Rankine	degrees Fahrenheit	°F = °R − 459.67
degrees Fahrenheit	degrees Rankine	°R = °F + 459.67
degrees Rankine	kelvins	K = °R × 5/9
kelvins	degrees Rankine	°R = K × 9/5
degrees Rankine	degrees Celsius	°C = °R × 5/9 - 273.15
degrees Celsius	degrees Rankine	°R = (°C +273.15) × 9/5
Note that for temperature intervals rather than temperature readings, 1 R° = 1 F° and 1 R° = 5/9 C° Additional conversion formulas [Conversion calculator for units of temperature]

Rankine is a thermodynamic temperature scale named after the Scottish engineer and physicist William John Macquorn Rankine, who proposed it in 1859.

The symbol is °R (note that this symbol is also used to stand for the Rømer and Réaumur scales). Like Kelvin, Rankine zero is absolute zero, but Fahrenheit degrees are used. As a result, a difference of 1 R° is equal to a difference of 1 F°, but 0 °R is −459.67 °F.

The Rankine cycle is an idealised thermodynamic cycle for a steam engine, i.e. one using water as the working fluid.

Comparison of temperature scales

Comparison of temperature scales
Comment	Kelvin	Celsius	Fahrenheit	Rankine	Delisle	Newton	Réaumur	Rømer
Absolute zero	0	−273.15	−459.67	0	559.725	−90.14	−218.52	−135.90
Coldest recorded surface temperature on Earth (Vostok, Antarctica - July 21, 1983)	184	−89	−128.2	331.47	283.5	−29.37	−71.2	−39.225
Fahrenheit's ice/salt mixture	255.37	−17.78	0	459.67	176.67	−5.87	−14.22	−1.83
standard pressure)	273.15	0	32	491.67	150	0	0	7.5
Average surface temperature on Earth	288	15	59	518.67	127.5	4.95	12	15.375
Average human body temperature ¹	309.95	36.8	98.24	557.91	94.8	12.144	29.44	26.82
(Al 'Aziziyah>Al 'Aziziyah, Libya - September 13, 1922)	331	58	136.4	596.07	63	19.14	46.4	37.95
standard pressure)	373.15	100	212	671.67	0	33	80	60
Titanium melts	1941	1668	3034	3494	−2352	550	1334	883
surface of the Sun	5800	5526	9980	10440	−8140	1823	4421	2909

¹ Normal human body temperature is 36.8 °C ±0.7 °C, or 98.2 °F ±1.3 °F. The commonly given value 98.6 °F is simply the exact conversion of the nineteenth-century German standard of 37 °C. Since it does not list an acceptable range, it could therefore be said to have excess (invalid) precision. Here's a [list] of various measurements.
Some numbers in this table have been rounded off.

Rankine

Comparison of temperature scales

See also