🌡️ Celsius to Delisle Converter
Instantly convert temperatures from Celsius (°C) to Delisle (°De). The Delisle scale is an inverted temperature scale , higher °De values mean colder temperatures. Invented in 1732 by French astronomer Joseph-Nicolas Delisle, it was used in Russia for over a century.
What Is the Delisle Scale?
The Delisle scale (°De) is a temperature scale invented in 1732 by the French astronomer Joseph-Nicolas Delisle (1688–1768). It is notable for being one of the few inverted temperature scales , higher measurements in degrees Delisle correspond to colder temperatures, unlike most other temperature scales.
Key characteristics of the Delisle scale:
- Boiling point of water: 0 °De (the scale's fixed zero point)
- Freezing point of water: 150 °De (recalibrated in 1738 by Josias Weitbrecht)
- Degree size: 1 °De = 2/3 °C = 1.2 °F
- Absolute zero: Approximately 559.725 °De
- Historical use: Widely used in Russia for about a century, particularly at the St. Petersburg observatory
The Delisle scale was one of the first inverted scales and influenced the development of the Celsius scale, which originally also ran from 0 for boiling water to 100 for freezing water.
How to Convert Celsius to Delisle
The formula to convert Celsius to Delisle is:
°De = (100 − °C) × 3/2
Alternatively: °De = (100 − °C) × 1.5
This formula works because:
- At 0 °C (water freezing), °De = (100 − 0) × 1.5 = 150 °De
- At 100 °C (water boiling), °De = (100 − 100) × 1.5 = 0 °De
- At −100 °C, °De = (100 − (−100)) × 1.5 = 300 °De
For example, to convert 20 °C (room temperature) to Delisle:
°De = (100 − 20) × 3/2
°De = 80 × 1.5
°De = 120 °De
Why Use This Converter?
- Instant results: Get accurate conversions in real-time.
- Step-by-step breakdown: See exactly how the conversion is calculated.
- Inverted scale support: Correctly handles the unique reversed nature of the Delisle scale.
- Common reference table: Quickly check key temperatures and their Delisle equivalents.
- Free & private: No registration, no data storage , all calculations are done in your browser.
❓ Celsius to Delisle FAQ
What is the formula to convert Celsius to Delisle?
The formula is °De = (100 − °C) × 3/2. Alternatively, you can use °De = (100 − °C) × 1.5.
Why is the Delisle scale inverted?
Delisle originally set the boiling point of water as 0 and measured the contraction of mercury as temperature decreased. This created a scale where higher numbers mean colder temperatures.
What is the freezing point of water in Delisle?
Water freezes at 150 °De (0 °C).
What is the boiling point of water in Delisle?
Water boils at 0 °De (100 °C).
What is absolute zero in Delisle?
Absolute zero (−273.15 °C) is approximately 559.725 °De.
Who invented the Delisle scale?
The Delisle scale was invented in 1732 by the French astronomer Joseph-Nicolas Delisle (1688–1768).
Is the Delisle scale still used today?
The Delisle scale is primarily of historical interest today and is encountered in the history of science and temperature conversion exercises.
What is the relationship between Delisle and Celsius?
A change of 1 °C corresponds to a change of 1.5 °De. The scales have opposite directions , as Celsius increases, Delisle decreases.
How accurate is this converter?
This converter provides highly accurate results using the standard conversion formula °De = (100 − °C) × 3/2. You can adjust the decimal precision to suit your needs.
Is this converter free?
Yes, this converter is completely free to use. No registration or personal data storage is required.