Kelvin to Réaumur Converter
Unit Converter
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6 units available
6 categories total
How to Convert Kelvin to Réaumur
To Celsius: °C = K − 273.15. To Fahrenheit: °F = (K − 273.15) × 9/5 + 32. To Rankine: °R = K × 9/5.
K = °C + 273.15. The kelvin scale starts at absolute zero (0 K = −273.15 °C). Same degree size as Celsius.
For example, 1 Kelvin (K) = -217.72 Réaumur (°Ré).
Kelvin to Réaumur — Common Values
| Kelvin (K) | Réaumur (°Ré) |
|---|---|
| 0.1 | -218.44 |
| 0.5 | -218.12 |
| 1 | -217.72 |
| 2 | -216.92 |
| 5 | -214.52 |
| 10 | -210.52 |
| 25 | -198.52 |
| 50 | -178.52 |
| 100 | -138.52 |
| 500 | 181.48 |
| 1000 | 581.48 |
About Kelvin (K)
Definition
The kelvin is the SI base unit of thermodynamic temperature, defined by fixing the Boltzmann constant at exactly 1.380649 × 10⁻²³ J/K. Zero kelvin (0 K) is absolute zero.
Mathematical Relationship
K = °C + 273.15. The kelvin scale starts at absolute zero (0 K = −273.15 °C). Same degree size as Celsius.
Conversion Formula
To Celsius: °C = K − 273.15. To Fahrenheit: °F = (K − 273.15) × 9/5 + 32. To Rankine: °R = K × 9/5.
Practical Applications
Color temperature of lights (e.g., 2700 K warm white, 6500 K daylight), cryogenics, and engineering thermodynamics.
Interesting Facts
The cosmic microwave background radiation has a temperature of 2.725 K. The surface of the Sun is about 5,778 K. Absolute zero has never been fully reached.
Common Mistakes
Writing '°K' instead of 'K' — kelvin never uses a degree sign. Also, confusing 0 K with 0 °C.
Educational Tips
Kelvin = Celsius + 273.15. There are no negative kelvins (in classical physics). Absolute zero (0 K) is the theoretical minimum temperature.
About Réaumur (°Ré)
Definition
The degree Réaumur is a historical temperature scale where water freezes at 0 °Ré and boils at 80 °Ré at standard pressure.
Mathematical Relationship
1 °Ré = 1.25 °C. The Réaumur scale divides the freezing-to-boiling range of water into 80 degrees instead of 100.
Conversion Formula
To Celsius: °C = °Ré × 5/4. To Fahrenheit: °F = °Ré × 9/4 + 32. To Kelvin: K = °Ré × 5/4 + 273.15.
Practical Applications
Some traditional Italian pasta and cheese production references still mention Réaumur temperatures from historical recipes.
Interesting Facts
Réaumur used an alcohol-based thermometer, not mercury. Russia used the Réaumur scale as its standard until the early 20th century.
Common Mistakes
Confusing °Ré with °R (Rankine) — they are entirely different scales. Always use the full abbreviation °Ré.
Educational Tips
Think of Réaumur as 'Celsius with 80 divisions instead of 100.' Multiply Réaumur by 1.25 to get Celsius.