Rømer to Réaumur Conversion Calculator: Free Online Tool
Convert degrees Rømer to degrees Réaumur with our free online temperature converter.
Rømer to Réaumur Calculator
How to Use the Calculator:
- Enter the value you want to convert in the 'From' field (Rømer).
- 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 Rømer to Réaumur
Temperature conversions like Rømer to Réaumur use specific non-linear formulas.
Formula:
First convert °Rø to °C: °C = (°Rø - 7.5) × 40/21. Then convert °C to °Ré: °Ré = °C × 4/5Example Calculation:
Convert 10°Rø:
1. °C = (10 - 7.5) × 40/21 = 4.76°C
2. °Ré = 4.76 × 4/5 = 3.81°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 Rømer and a Réaumur?
The Rømer scale (°Rø) is a historical temperature scale where the freezing point of water is set at 7.5 degrees and the boiling point at 60 degrees.
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 Rømer 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 Rømer and Réaumur
Invented by the Danish astronomer Ole Christensen Rømer in 1701. Rømer based his scale on two points: the freezing point of brine (0 °Rø) and the boiling point of water (60 °Rø). He later observed pure water froze at 7.5 °Rø. Daniel Fahrenheit visited Rømer and reportedly based his own scale on Rømer's work, multiplying the number of degrees by four.
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 It gained popularity in parts of Europe, particularly France and Germany, but has largely been replaced by Celsius.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 Rømer and degrees Réaumur
Explore the typical applications for both Rømer (imperial/US) and Réaumur (imperial/US) to understand their common contexts.
Common Uses for degrees Rømer
- Historical Significance: Primarily of historical interest as a precursor to the Fahrenheit scale.
- Not used in modern scientific or general applications.
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 Rømer (°Rø)
What are the freezing and boiling points of water in Rømer?
Water freezes at 7.5 °Rø and boils at 60 °Rø.
How did Rømer influence Fahrenheit?
Fahrenheit adopted Rømer's use of two reference points and expanded the scale, likely multiplying Rømer's degrees by 4 to avoid fractions and negative numbers for everyday temperatures.
How does Rømer relate to Celsius?
The relationship is °Rø = °C × 21/40 + 7.5.
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.