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] Delisle was the author of Mémoires pour servir à l'histoire et aux progrès de l'Astronomie, de la Géographie et de la Physique (Memories to Serve the History and Progress of Astronomy, Geography and Physics) (1738). The Delisle scale is notable as one of the few temperature scales that is inverted from the amount of thermal energy it measures; 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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