Rankine to Réaumur Conversion Calculator: Free Online Tool
Convert degrees Rankine to degrees Réaumur with our free online temperature converter.
Rankine to Réaumur Calculator
How to Use the Calculator:
- Enter the value you want to convert in the 'From' field (Rankine).
- The converted value in Réaumur will appear automatically in the 'To' field.
- Use the dropdown menus to select different units within the Temperature category.
- Click the swap button (⇌) to reverse the conversion direction.
How to Convert Rankine to Réaumur
Temperature conversions like Rankine to Réaumur use specific non-linear formulas.
Formula:
First convert °R to °C: °C = (°R - 491.67) × 5/9. Then convert °C to °Ré: °Ré = °C × 4/5Example Calculation:
Convert 10°R:
1. °C = (10 - 491.67) × 5/9 = -267.59°C
2. °Ré = -267.59 × 4/5 = -214.08°Ré
Disclaimer: For Reference Only
These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.
Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.
What is a Rankine and a Réaumur?
The Rankine scale (°R or °Ra) is an absolute thermodynamic temperature scale named after the Scottish engineer and physicist William John Macquorn Rankine. Similar to the Kelvin scale, its zero point is absolute zero, but the degree size is the same as that of the Fahrenheit scale.
The Réaumur scale (°Ré, °Re, °R) is a temperature scale where the freezing point of water is 0 degrees and the boiling point is 80 degrees.
Note: The Rankine is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Réaumur belongs to the imperial/US customary system.
History of the Rankine and Réaumur
The scale was proposed by William Rankine in 1859, shortly after the Kelvin scale was developed. It was created to provide an absolute temperature scale that directly corresponded with the Fahrenheit degrees used widely in engineering at the time.
Developed by René Antoine Ferchault de Réaumur in 1730, it was based on the expansion of alcohol. He marked the freezing point as 0 and the boiling point of the alcohol solution as 80. It gained popularity in parts of Europe, particularly France and Germany, but has largely been replaced by Celsius.
Common Uses for degrees Rankine and degrees Réaumur
Explore the typical applications for both Rankine (imperial/US) and Réaumur (imperial/US) to understand their common contexts.
Common Uses for degrees Rankine
- Engineering (Thermodynamics): Used in some engineering fields, particularly in the United States, where calculations often involve Fahrenheit. It simplifies thermodynamic calculations (like the ideal gas law) when using Imperial units.
- Historical Context: Found in older engineering texts and data.
Common Uses for degrees Réaumur
- Historical Context: Found in old scientific literature and historical documents.
- Specific Industries: Occasionally used in some specific contexts, such as cheesemaking in Italy (for Parmigiano-Reggiano) or for measuring sugar syrup temperature in some Dutch cooking.
Frequently Asked Questions
Questions About Rankine (°R)
What is absolute zero on the Rankine scale?
Absolute zero is 0 °R, which is equivalent to -459.67 °F or -273.15 °C.
How does Rankine relate to Fahrenheit?
A change of 1 °R is equal to a change of 1 °F. The formula is °R = °F + 459.67.
How does Rankine relate to Kelvin?
The Rankine scale uses Fahrenheit degrees, while Kelvin uses Celsius degrees. Both start at absolute zero. The formula is °R = K × 9/5.
About Réaumur (°Ré)
What are the freezing and boiling points of water in Réaumur?
Water freezes at 0 °Ré and boils at 80 °Ré.
How does Réaumur relate to Celsius?
The Réaumur degree is larger than the Celsius degree. The formula is °Ré = °C × 4/5.
Is the Réaumur scale still commonly used?
No, it is rarely used today, having been largely superseded by the Celsius scale.