🌡️ Fahrenheit to Delisle Converter
Instantly convert temperatures from Fahrenheit (°F) to Delisle (°De). The Delisle scale is a historical temperature scale invented in 1732 by French astronomer Joseph-Nicolas Delisle. It was widely used in Russia for nearly a century before being replaced by the Celsius scale.
What Is the Delisle Scale?
The Delisle scale (°De) is a historical temperature scale invented in 1732 by the French astronomer Joseph-Nicolas Delisle (1688–1768). It is unique among temperature scales because it is inverted , the temperature decreases as heat increases, with zero set at the boiling point of water.
Key characteristics of the Delisle scale:
- Zero point: 0 °De is the boiling point of water (212 °F).
- Freezing point: 150 °De is the freezing point of water (32 °F).
- Inverted scale: Higher °De values mean colder temperatures.
- Historical use: Widely used in Russia for nearly 100 years.
- Absolute zero: Approximately 559.73 °De (−459.67 °F).
- Conversion: °De = (212 − °F) × 5/6.
The Delisle scale was originally developed for meteorological observations in cold climates. Delisle's thermometer design used mercury as the working fluid and was calibrated to work reliably in the low temperatures of St. Petersburg, Russia.
How to Convert Fahrenheit to Delisle
The formula to convert Fahrenheit to Delisle is:
°De = (212 − °F) × 5/6
Where 212 °F (boiling point) = 0 °De, and 32 °F (freezing point) = 150 °De.
This formula works because the Delisle scale has 150 degrees between the freezing and boiling points of water (0 °De to 150 °De), while the Fahrenheit scale has 180 degrees between these points (32 °F to 212 °F). Therefore, 1 °De = 180/150 = 1.2 °F.
For example, to convert 212 °F (the boiling point of water) to Delisle:
°De = (212 − 212) × 5/6
°De = 0 × 5/6
°De = 0 °De
To convert 32 °F (the freezing point of water) to Delisle:
°De = (212 − 32) × 5/6
°De = 180 × 5/6
°De = 150 °De
Why Use This Converter?
- Instant results: Get accurate conversions in real-time.
- Step-by-step breakdown: See exactly how the conversion is calculated.
- Common reference table: Quickly check temperatures from −40 °F to 212 °F.
- Historical context: Learn about this fascinating historical temperature scale.
- Free & private: No registration, no data storage , all calculations are done in your browser.
❓ Fahrenheit to Delisle FAQ
What is the formula to convert Fahrenheit to Delisle?
The formula is °De = (212 − °F) × 5/6. For example, 32 °F (freezing point) = 150 °De, and 212 °F (boiling point) = 0 °De.
What is the Delisle scale?
The Delisle scale is a historical temperature scale invented in 1732 by French astronomer Joseph-Nicolas Delisle. It is an inverted scale where 0 °De is the boiling point of water and 150 °De is the freezing point of water.
Why is the Delisle scale inverted?
Delisle designed his thermometer for meteorological observations in cold climates. The inverted scale made it easier to measure and record decreasing temperatures. The scale was widely used in Russia for nearly a century.
What is absolute zero in Delisle?
Absolute zero (−459.67 °F, 0 K, −273.15 °C) is approximately 559.73 °De.
What is the freezing point of water in Delisle?
Water freezes at 150 °De (32 °F, 0 °C).
What is the boiling point of water in Delisle?
Water boils at 0 °De (212 °F, 100 °C).
Who invented the Delisle scale?
The Delisle scale was invented by Joseph-Nicolas Delisle (1688–1768), a French astronomer.
Is the Delisle scale still used today?
No, the Delisle scale is largely obsolete today. It was replaced by the Celsius scale in most applications, but it remains an interesting historical temperature scale.
How accurate is this converter?
This converter provides highly accurate results using the standard conversion formula °De = (212 − °F) × 5/6. 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.