Convert Newton to Delisle
Convert degrees newton to degrees delisle instantly. °De = 150 − (°N × 50/11) — use the live calculator, the exact formula, a reference-temperature table and worked examples. Also check the Delisle to Newton converter for the reverse conversion.
Units explained
Newton
The degree Newton (°N) sets the freezing point of water at 0 °N and the boiling point at 33 °N, making one degree Newton equal to exactly 100/33 kelvins (about 3.03 K) — the largest degree of any classic scale.
Devised by Isaac Newton using linseed-oil thermometers and a ladder of everyday reference points such as melting snow and the heat of the human body, published anonymously around 1701.
Never adopted for practical measurement, but historically important: Newton's idea of anchoring a scale to two reproducible fixed points directly influenced Celsius's centigrade approach four decades later.
Published by Isaac Newton in the Philosophical Transactions of the Royal Society in London, around 1701.
Delisle
The degree Delisle (°De) is a famously reversed scale: water boils at 0 °De and freezes at 150 °De, so numbers increase as temperature falls. One degree Delisle corresponds to exactly −2/3 of a kelvin.
Invented by French astronomer Joseph-Nicolas Delisle while directing the observatory in St. Petersburg, Russia; his thermometers were originally graduated by the contraction of mercury cooling down from the boiling point of water.
Widely used in 18th-century Russia for about a century. Today it appears only in the history of thermometry, where it is the textbook example of an inverted temperature scale.
Created by Joseph-Nicolas Delisle in St. Petersburg in 1732; recalibrated to the familiar 150-division form by Josias Weitbrecht in 1738.
Newton to Delisle conversion formula
The exact relationship between degrees newton and degrees delisle:
To convert degrees newton to degrees delisle, multiply the value by 50/11 and subtract the result from 150. To reverse, multiply the value by 11/50 and subtract the result from 33.
Reference anchors: water freezes at 0 °N = 150 °De and boils at 33 °N = 0 °De (at standard atmospheric pressure).
How to use this converter
Type a value into the calculator. The result in degrees delisle updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Delisle to Newton converter for the reverse direction.
Step-by-step: convert degrees newton to degrees delisle
- Write down the temperature in degrees newton (°N).
- Multiply the value by 50/11 and subtract the result from 150.
- The result is the same temperature expressed in degrees delisle (°De).
- To reverse, multiply the value by 11/50 and subtract the result from 33 — or open the Delisle to Newton converter.
Worked examples
Example 1 — Convert 12.21 °N to °De (human body temperature):
150 − (12.21 × 50/11) = 94.5 °De
Example 2 — Convert 33 °N to °De (the boiling point of water):
150 − (33 × 50/11) = 0 °De
Newton to Delisle conversion table
Physically meaningful reference temperatures, from absolute zero to the surface of the Sun, converted from degrees newton to degrees delisle:
| Newton [°N] | Delisle [°De] | Reference point |
|---|---|---|
| -90.1395 | 559.725 | Absolute zero |
| -13.2 | 210 | Where Celsius and Fahrenheit coincide (−40°) |
| -5.8666666667 | 176.6666666667 | Zero Fahrenheit (0 °F) |
| 0 | 150 | Water freezes (0 °C / 32 °F) |
| 0.0033 | 149.985 | Triple point of water |
| 3.3 | 135 | Cool day (10 °C / 50 °F) |
| 6.6 | 120 | Room temperature (20 °C / 68 °F) |
| 8.25 | 112.5 | Standard laboratory temperature (25 °C) |
| 9.9 | 105 | Hot day (30 °C / 86 °F) |
| 12.21 | 94.5 | Human body temperature (37 °C / 98.6 °F) |
| 13.2 | 90 | Heat-wave day (40 °C / 104 °F) |
| 16.5 | 75 | Hot tap water (50 °C / 122 °F) |
| 33 | 0 | Water boils (100 °C / 212 °F) |
| 59.4 | -120 | Moderate baking oven (180 °C / 356 °F) |
| 1816.6005 | -8107.275 | Surface of the Sun (≈5,505 °C) |
Frequently asked questions
What is 12.21 °N in °De?
How do I convert degrees newton to degrees delisle?
How do I convert degrees delisle back to degrees newton?
At what temperature do the Newton and Delisle scales read the same number?
Can a temperature be below absolute zero?
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Sources & references
Conversion relationship (°De = 150 − (°N × 50/11)) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- BIPM — International Temperature Scale of 1990 (ITS-90)
The internationally agreed practical temperature scale, defining fixed points (including the triple point of water at 273.16 K) and interpolation instruments used by national metrology institutes for thermometer calibration worldwide.
- CODATA Internationally Recommended Values of the Fundamental Physical Constants
Committee on Data of the International Science Council; authoritative source for the masses of fundamental particles (electron, proton, neutron) and the atomic mass constant.