The Rankine and Réaumur scales are both temperature scales with unique origins and applications. While less common than Celsius or Fahrenheit, understanding their interconversion can be valuable in various scientific and historical contexts.
The Rankine scale, named after Scottish engineer William John Macquorn Rankine, is an absolute thermodynamic temperature scale. This means its zero point coincides with absolute zero (the theoretical point of minimum energy). The Rankine scale uses degrees Rankine (°R or °Ra) and has the same unit size as the Fahrenheit scale.
The Réaumur scale, developed by French scientist René Antoine Ferchault de Réaumur, is a temperature scale where the freezing point of water is 0°R and the boiling point of water is 80°Ré.
The formula to convert Rankine to Réaumur is:
°Ré = (°R - 491.67) * (4/9)
where:
Rankine | Réaumur | Rankine | Réaumur | Rankine | Réaumur | Rankine | Réaumur |
---|---|---|---|---|---|---|---|
1°R | -218.08ºRé | 21°R | -209.19ºRé | 41°R | -200.30ºRé | 61°R | -191.41ºRé |
2°R | -217.63ºRé | 22°R | -208.74ºRé | 42°R | -199.85ºRé | 62°R | -190.96ºRé |
3R | -217.19ºRé | 23°R | -208.30ºRé | 43°R | -199.41ºRé | 63°R | -190.52Ré |
4°R | -216.74ºRé | 24°R | -207.85ºRé | 44°R | -198.96ºRé | 64°R | -190.08ºRé |
5°R | -216.30ºRé | 25°R | -207.41ºRé | 45°R | -198.52ºRé | 65°R | -189.63ºRé |
6°R | -215.85ºRé | 26°R | -206.96ºRé | 46°R | -198.08ºR | 66°R | -189.19ºRé |
7°R | -215.41ºRé | 27°R | -206.52ºRé | 47°R | -197.63ºRé | 67°R | -188.74ºRé |
8°R | -214.96ºRé | 28°R | -206.08ºRé | 48°R | -197.19ºRé | 68°R | -188.30ºRé |
9°R | -214.52ºRé | 29°R | -205.63ºRé | 49°R | -196.74ºRé | 69°R | -187.85ºRé |
10°R | -214.08ºRé | 30°R | -205.19ºRé | 50°R | -196.30ºRé | 70°R | -187.41ºR |
11°R | -213.63ºRé | 31°R | -204.74ºRé | 51R | -195.85ºRé | 71°R | -186.96ºRé |
12°R | -213.19ºRé | 32°R | -204.30ºRé | 52°R | -195.41ºRé | 72°R | -186.52ºRé |
13°R | -212.74ºRé | 33°R | -203.85ºRé | 53°R | -194.96ºR | 73°R | -186.08ºRé |
14°R | -212.30ºRé | 34R | -203.41ºRé | 54°R | -194.52ºRé | 74°R | -185.63ºRé |
15°R | -211.85ºRé | 35°R | -202.96ºRé | 55°R | -194.08ºRé | 75°R | -185.19ºRé |
16°R | -211.41ºRé | 36°R | -202.52ºR | 56°R | -193.63ºRé | 76°R | -184.74ºRé |
17R | -210.96ºRé | 37°R | -202.08ºRé | 57°R | -193.19ºRé | 77°R | -184.30Ré |
18°R | -210.52ºRé | 38°R | -201.63ºRé | 58°R | -192.74ºRé | 78°R | -183.85ºRé |
19°R | -210.08ºR | 39°R | -201.19ºRé | 59°R | -192.30ºRé | 79°R | -183.41ºRé |
20°R | -209.63ºRé | 40°R | -200.74ºRé | 60°R | -191.85Ré | 80°R | -182.96ºRé |