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Réaumur to Celsius (°Ré to °C) Converter – 0°Ré, 80°Ré, 100°Ré, 150°Ré in °C

Convert Réaumur to Celsius and Celsius to Réaumur. Free online °Ré to °C calculator for historical temperature scale, European temperature conversions, and wine making temperature measurements.
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Réaumur to Celsius – Instant Historical Temperature Calculator

Réaumur (°Ré)

→

Celsius (°C)

Common Réaumur Temperature Examples

0 °Ré = 0 °C

Freezing point of water

80 °Ré = 100 °C

Boiling point of water

20 °Ré = 25 °C

Room temperature

100 °Ré = 125 °C

Above boiling point

Réaumur to Celsius Converter for Historical and European Temperature Scales

Instantly convert Réaumur to Celsius with this free online calculator. Perfect for historical temperature scale conversions, European temperature measurements, wine making processes, and cheese production temperature control. Uses the exact conversion formula for precise results.

How to Use

Enter Réaumur temperature and see Celsius instantly. Use the swap button to convert °C back to °Ré. Copy results for historical research and temperature scale analysis.

Réaumur to Celsius: Definition, History, Historical Uses, and Examples

Definition

Réaumur (°Ré) is a historical temperature scale where 0°Ré = freezing point of water and 80°Ré = boiling point of water at 1 atm. Celsius (°C) is the metric temperature scale where 0°C = freezing and 100°C = boiling point of water. The conversion formula is: °C = °Ré × 5/4.

Origin or History

The Réaumur scale was proposed by French naturalist René Antoine Ferchault de Réaumur in 1730. It was designed as a practical temperature measurement system, dividing the temperature range between freezing and boiling water into 80 degrees. The scale was widely used in Europe, particularly in France, Germany, and Russia, until the 19th century.

Historical Use

  • European Science: Official temperature scale used throughout Europe for scientific research.
  • Wine Making: Temperature control in wine production and fermentation processes.
  • Cheese Production: Temperature monitoring in dairy and cheese making.
  • Industrial Processes: Temperature control in manufacturing and food processing.
  • Meteorology: Weather recording and climate studies in Europe.

Examples

Réaumur (°Ré)Celsius (°C)Historical Context
00Water freezing point
2025Room temperature
80100Water boiling point
100125Above boiling point

Frequently Asked Questions

Why was the Réaumur scale created?
René Réaumur created this scale in 1730 as a practical temperature measurement system. He chose 80 degrees between freezing and boiling points because 80 is easily divisible by many numbers (2, 4, 5, 8, 10, 16, 20, 40), making calculations simpler.
How to convert 100°Ré to Celsius for historical research?
100 × 5/4 = 125°C. This represents a temperature above the boiling point of water, commonly used in industrial processes and cooking.
What is the relationship between Réaumur and Celsius?
Réaumur = Celsius × 4/5, and Celsius = Réaumur × 5/4. The Réaumur scale has 80 degrees between freezing and boiling, while Celsius has 100 degrees, making the conversion factor 5/4.
When would I need to convert Réaumur to Celsius?
Common scenarios include: reading European historical literature, studying wine making processes, cheese production temperature control, European historical research, and converting historical temperature measurements.

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