Delisle scale

Delisle temperature conversion formulae
from Delisle to Delisle
Celsius x °De ≘ (100 − x × ⁠2/3⁠) °C x °C ≘ (100 − x) × ⁠3/2⁠ °De
Fahrenheit x °De ≘ (212 − x × ⁠6/5⁠) °F x °F ≘ (212 − x) × ⁠5/6⁠ °De
Kelvin x °De ≘ (373.15 − x × ⁠2/3⁠) K x K ≘ (373.15 − x) × ⁠3/2⁠ °De
Rankine x °De ≘ (671.67 − x × ⁠6/5⁠) °R x °R ≘ (671.67 − x) × ⁠5/6⁠ °De
For temperature intervals rather than specific temperatures,
1 °De = ⁠2/3⁠ °C = 1.2 °F
Conversion between temperature scales
Black and white drawing of Joseph Nicolas Delisle from 1803. He is facing slightly to the left. His hair appears to be grey curls or a wig. He is wearing a ruffled shirt.
Joseph-Nicolas Delisle

The Delisle scale is a temperature scale invented in 1732 by the French astronomer Joseph-Nicolas Delisle (1688–1768).[1] The Delisle scale is notable as one of the few temperature scales that are inverted from the amount of thermal energy they measure; unlike most other temperature scales, higher measurements in degrees Delisle are colder, while lower measurements are warmer.[a]

  1. ^ Camuffo, Dario (2002). Improved Understanding of Past Climatic Variability from Early Daily European Instrumental Sources. Kluwer Academic Publishers. p. 314.


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