›› Convert degree Rankine to degree Delisle


Rankine
Delisle

›› More information from the unit converter

How many Rankine in 1 Delisle? The answer is -1.2.
We assume you are converting between degree Rankine and degree Delisle.
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Rankine or Delisle
The SI base unit for temperature is the kelvin.
1 kelvin is equal to 1.8 Rankine, or -1.5 Delisle.
Note that rounding errors may occur, so always check the results.
Use this page to learn how to convert between degrees Rankine and degrees Delisle.
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›› Common temperature conversions

Rankine to Reaumur
Rankine to newton
Rankine to kelvin
Rankine to Romer
Rankine to Celsius
Rankine to Fahrenheit


›› Definition: Rankine

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

The symbol is °R (or °Ra if necessary to distinguish it from the Rømer and Réaumur scales). As with the Kelvin scale (symbol: K), zero on the Rankine scale is absolute zero. The Rankine scale differs from the Kelvin scale in that it uses smaller, degree Fahrenheit-size increments rather than degree Celsius-size increments. A temperature of 459.67 °R is precisely equal to and 0 °F.

Many engineering fields in the U.S. measure thermodynamic temperature using the Rankine scale. However, throughout the scientific world where measurements are made in SI units, thermodynamic temperature is measured in kelvins.


›› Definition: Delisle

The Delisle scale is a temperature scale invented in 1732 by the French astronomer Joseph-Nicolas Delisle (1688–1768). It is similar to that of Réaumur. Delisle was the author of Mémoires pour servir à l'histoire et aux progrès de l'Astronomie, de la Géographie et de la Physique (1738).

He had been invited to Russia by Peter the Great. In 1732 he built a thermometer that used mercury as a working fluid. Delisle chose his scale using the temperature of boiling water as the fixed zero point and measured the contraction of the mercury (with lower temperatures) in hundred-thousandths. The Celsius scale too originally ran from zero for boiling water down to 100 for freezing water. This was reversed to its modern order some time after his death, in part at the instigation of Daniel Ekström, the manufacturer of most of the thermometers used by Celsius.

The Delisle thermometers usually had 2400 graduations, appropriate to the winter in St. Petersburg. In 1738 Josias Weitbrecht (1702–1747) recalibrated the Delisle thermometer with 0 degrees as the boiling point and 150 degrees as the freezing point of water. The Delisle thermometer remained in use for almost 100 years in Russia.

Thus, the unit of this scale, the Delisle degree (sometimes spelled de Lisle), is -2/3 of a kelvin (or a degree Celsius) and absolute zero is at 559.725 Delisle degrees.


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