Delisle to Réaumur (°De to °Ré) Converter
1 Delisle equals 79.4667 Réaumur (1 °De = 79.4667 °Ré). Convert Delisle to Réaumur with formula, table, and examples.
To convert Delisle to Reaumur, use the formula: Re = 80 - De x 8/15. The Delisle scale runs backwards compared to most temperature scales, with higher numbers indicating colder temperatures. 0 Delisle (boiling) = 80 degrees Reaumur, 150 Delisle (freezing) = 0 degrees Reaumur.
How to Convert Delisle to Réaumur
- Convert to Kelvin: K = 373.15 - °De * 2 / 3
- Convert to Réaumur: °Ré = (K - 273.15) * 4 / 5
- Read the result in Réaumur
Good to Know About Delisle to Réaumur Conversion
The Delisle and Reaumur scales represent two French contributions to thermometry that both lost to the Swedish Celsius scale. France, despite producing both scales and later the metric system, ended up adopting a temperature scale invented by a Swede. This is one of science's gentle ironies: the nation that rationalized all other measurement could not produce the winning temperature scale.
Delisle to Réaumur: What You Need to Know
This conversion bridges the 18th-century Russian-adopted Delisle scale with the Reaumur scale. Historical Russian temperature records from the era of Catherine the Great and earlier require this conversion for comparison with modern scientific data expressed in Reaumur units.
What is a Delisle? °De
A historical inverted temperature scale invented by Joseph-Nicolas Delisle in 1732. Water boils at 0 °De and freezes at 150 °De. Higher numbers mean colder temperatures.
Learn more about Delisle →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 →Going the other way? Use our Réaumur to Delisle converter.
Delisle to Réaumur FAQ
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Use the formula Re = 80 - De x 8/15. 0 Delisle (boiling) = 80 degrees Reaumur, 150 Delisle (freezing) = 0 degrees Reaumur.
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Delisle measured how far below the boiling point a temperature was. Higher numbers meant further from boiling, which means colder. This inverted logic was logical for his laboratory work but confusing for everyday use.
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When interpreting historical Russian scientific records from the 18th-19th centuries and converting them to Reaumur for modern analysis or comparison.
Non-Frequently Asked Questions About Delisle to Réaumur
Questions nobody should ask - but someone did.
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Rene Antoine Ferchault de Reaumur published his scale in 1730, just two years before Delisle published his in 1732. Both were French scientists working on thermometry at the same time. Reaumur's scale gained wider adoption in continental Europe, while Delisle's found its niche in Russia. They were contemporaries who solved the same problem differently.
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Not entirely. France in the early 18th century was the center of European scientific activity. The French Academy of Sciences funded thermometric research, attracting Reaumur and sending Delisle to Russia. Both scales emerged from the same intellectual environment - the French Enlightenment's obsession with rational measurement that would later produce the metric system itself.
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Reaumur had the longer and broader run. It was standard in France, Germany, and parts of Europe for over a century, and it still appears occasionally in European cheese and confectionery traditions. Delisle was confined mainly to Russia. But both were eventually eclipsed by Celsius, which combined the simplicity of Reaumur (0-100 range for water) with wider international adoption.
Related Articles About Delisle to Réaumur
Need the reverse? Use our Réaumur to Delisle converter. See all Temperature converters.