Réaumur to Rømer (°Ré to °Rø) Converter
1 Réaumur equals 8.1563 Rømer (1 °Ré = 8.1563 °Rø). Convert Réaumur to Rømer with formula, table, and examples.
To convert Reaumur to Romer, use the formula: Ro = Re x 21/32 + 7.5. The Reaumur scale is the historical European scale once standard in France and Germany, while the Romer scale is the early Danish scale that influenced Fahrenheit. Water freezes at 0 degrees Re (7.5 Ro) and boils at 80 degrees Re (60 Ro).
How to Convert Réaumur to Rømer
- Convert to Kelvin: K = °Ré * 5 / 4 + 273.15
- Convert to Rømer: °Rø = (K - 273.15) * 21 / 40 + 7.5
- Read the result in Rømer
Common Réaumur to Rømer Conversions
| Réaumur (°Ré) | Rømer (°Rø) | Status |
|---|---|---|
| -30 °Ré | -12.19 °Rø | |
| -20 °Ré | -5.62 °Rø | |
| -10 °Ré | 0.94 °Rø | |
| 0 °Ré | 7.5 °Rø | |
| 5 °Ré | 10.78 °Rø | |
| 10 °Ré | 14.06 °Rø | |
| 15 °Ré | 17.34 °Rø | |
| 20 °Ré | 20.63 °Rø | |
| 25 °Ré | 23.91 °Rø | |
| 30 °Ré | 27.19 °Rø | |
| 40 °Ré | 33.75 °Rø | |
| 50 °Ré | 40.31 °Rø | |
| 60 °Ré | 46.88 °Rø | |
| 70 °Ré | 53.44 °Rø | |
| 80 °Ré | 60 °Rø | |
| 100 °Ré | 73.13 °Rø | |
| 200 °Ré | 138.75 °Rø |
Good to Know About Réaumur to Rømer Conversion
The history of temperature measurement is the history of scientific collaboration and competition across borders. The Reaumur scale (once widespread in continental Europe) and the Romer scale (influenced Fahrenheit) represent different national contributions to solving the same fundamental problem: how to assign numbers to the sensation of hot and cold.
Réaumur to Rømer: What You Need to Know
The Reaumur scale was created by Rene Antoine Ferchault de Reaumur, 1730, once widespread in continental Europe. The Romer scale was created by Ole Romer, Danish astronomer, around 1701, influenced Fahrenheit. Converting between them bridges different eras and different measurement philosophies in the history of thermometry.
What is a Réaumur? °Ré
A historical temperature scale where water freezes at 0 °Ré and boils at 80 °Ré. Named after René Antoine Ferchault de Réaumur. Once widely used in Europe.
Learn more about Réaumur →What is a Rømer? °Rø
A temperature scale proposed by Ole Christensen Rømer in 1701. Water freezes at 7.5 °Rø and boils at 60 °Rø. It influenced Fahrenheit's scale development.
Learn more about Rømer →Going the other way? Use our Rømer to Réaumur converter.
Réaumur to Rømer FAQ
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Use the formula Ro = Re x 21/32 + 7.5. At the freezing point of water: 0 Re = 7.5 Ro. At the boiling point: 80 Re = 60 Ro.
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This conversion is needed when interpreting historical scientific records, comparing temperature data across different measurement traditions, or completing engineering calculations that mix temperature scales from different national standards.
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Water freezes at 0 Re = 7.5 Ro. Water boils at 80 Re = 60 Ro. These two fixed points anchor both scales and provide easy verification of any conversion calculation.
Non-Frequently Asked Questions About Réaumur to Rømer
Questions nobody should ask - but someone did.
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They are certainly the most continental. Reaumur (French, 1730) spread across France, Germany, and Russia. Romer (Danish, 1701) stayed mainly in Denmark. Together they represent the 18th-century European fever for rational measurement that eventually produced the metric system. Both scales were noble attempts; both were outcompeted by Celsius, proving that in science, second place means eventual oblivion.
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Only if the professor has a cruel sense of humor. The conversion requires knowing both scales' reference points (Reaumur: 0-80 for water; Romer: 7.5-60 for water) and the formula Ro = Re x 21/32 + 7.5. No student has ever needed this in a career. But it tests whether they can apply a conversion formula under pressure, which is arguably the real lesson.
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The French Academy of Sciences would probably host it. Competitors would include Reaumur (French), Romer (Danish), Delisle (French, working in Russia), Newton (English), Fahrenheit (Polish-Dutch-English), and the up-and-coming Celsius (Swedish). The judges would argue for decades, which is essentially what happened historically. Celsius won by consensus around 1800 after all the others proved impractical.
Related Articles About Réaumur to Rømer
Need the reverse? Use our Rømer to Réaumur converter. See all Temperature converters.