Conversions

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Conversions

Kelvin to Delisle Calculator.

Converts a temperature from Kelvin to the Delisle scale, a historical temperature unit where water boils at 0 °De and freezes at 150 °De.

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Your inputs

How it works

  1. 1

    Enter the temperature in Kelvin.

  2. 2

    Subtract the Kelvin value from 373.15 (the boiling point of water in Kelvin).

  3. 3

    Multiply the result by 1.5 to get degrees Delisle.

  4. 4

    The result is the temperature in °De.

(373.15 - kelvin) * 1.5

Frequently asked questions

What is the Delisle scale?

The Delisle scale (°De) is a temperature scale invented by Joseph-Nicolas Delisle in 1732. It sets the boiling point of water at 0 °De and the freezing point at 150 °De, so higher Delisle values mean colder temperatures.

How do I convert from Delisle back to Kelvin?

Use the inverse formula: Kelvin = 373.15 - (Delisle / 1.5). For example, 0 °De equals 373.15 K (boiling point of water).

Why is the conversion factor 1.5?

The Delisle scale divides the interval between boiling and freezing (373.15 K - 273.15 K = 100 K) into 150 degrees. So 1 °De corresponds to 100/150 = 2/3 K, meaning 1 K equals 1.5 °De.

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Temperature in Delisle

0°De

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How it works

Converts a temperature from Kelvin to the Delisle scale, a historical temperature unit where water boils at 0 °De and freezes at 150 °De.

  1. Enter the temperature in Kelvin.
  2. Subtract the Kelvin value from 373.15 (the boiling point of water in Kelvin).
  3. Multiply the result by 1.5 to get degrees Delisle.
  4. The result is the temperature in °De.

Formulas

The math behind this calculator, written out so you can verify the result.

Kelvin to Delisle

°De = (373.15 - K) × 1.5

Subtract the Kelvin temperature from the boiling point of water (373.15 K) and multiply by 1.5 to get degrees Delisle.

Example:

Input: K = 300

Calculation: (373.15 - 300) × 1.5

Result: ≈ 109.73 °De

Real-world use cases

Where this calculation shows up in everyday life.

Historical temperature conversion

Convert modern Kelvin measurements to the historical Delisle scale for educational or archival purposes.

Example: Converting 300 K to 109.73 °De

Understanding temperature scales

Compare how different scales represent the same physical temperature, especially the inverted nature of Delisle.

Example: Water boils at 0 °De and freezes at 150 °De

Science education

Teach students about temperature conversion and the relationship between absolute and historical scales.

Example: Absolute zero (0 K) equals 559.73 °De

Tips and common mistakes

Tips

  • Remember that Delisle is inverted: higher °De means colder.
  • Kelvin is an absolute scale, so it never goes below 0.
  • For quick mental estimates, remember that 373.15 K is boiling point (0 °De) and 273.15 K is freezing (150 °De).
  • Use the formula in reverse to convert from Delisle to Kelvin.

Common Mistakes to Avoid

  • Forgetting to subtract from 373.15 instead of adding.
  • Using 273.15 as the reference point instead of 373.15.
  • Confusing the direction: higher Kelvin gives lower Delisle.

Assumptions and limitations

  • Use the stated inputs and units.
  • Results are estimates for planning and education.
  • Check measurements and source data before making an important decision.