Delisle to Rømer (°De → °Rø)
Formula
°De → kelvin → °RøConversion Table
| °De | °Rø |
|---|---|
| 0 | 60.000 |
| 1.0000 | 59.650 |
| 2.0000 | 59.300 |
| 3.0000 | 58.950 |
| 4.0000 | 58.600 |
| 5.0000 | 58.250 |
| 6.0000 | 57.900 |
| 7.0000 | 57.550 |
| 8.0000 | 57.200 |
| 9.0000 | 56.850 |
| 10.000 | 56.500 |
| 11.000 | 56.150 |
| 12.000 | 55.800 |
| 13.000 | 55.450 |
| 14.000 | 55.100 |
| 15.000 | 54.750 |
| 16.000 | 54.400 |
| 17.000 | 54.050 |
| 18.000 | 53.700 |
| 19.000 | 53.350 |
| °De | °Rø |
|---|---|
| 20.000 | 53.000 |
| 21.000 | 52.650 |
| 22.000 | 52.300 |
| 23.000 | 51.950 |
| 24.000 | 51.600 |
| 25.000 | 51.250 |
| 26.000 | 50.900 |
| 27.000 | 50.550 |
| 28.000 | 50.200 |
| 29.000 | 49.850 |
| 30.000 | 49.500 |
| 31.000 | 49.150 |
| 32.000 | 48.800 |
| 33.000 | 48.450 |
| 34.000 | 48.100 |
| 35.000 | 47.750 |
| 36.000 | 47.400 |
| 37.000 | 47.050 |
| 38.000 | 46.700 |
| 39.000 | 46.350 |
| °De | °Rø |
|---|---|
| 40.000 | 46.000 |
| 41.000 | 45.650 |
| 42.000 | 45.300 |
| 43.000 | 44.950 |
| 44.000 | 44.600 |
| 45.000 | 44.250 |
| 46.000 | 43.900 |
| 47.000 | 43.550 |
| 48.000 | 43.200 |
| 49.000 | 42.850 |
| 50.000 | 42.500 |
| 51.000 | 42.150 |
| 52.000 | 41.800 |
| 53.000 | 41.450 |
| 54.000 | 41.100 |
| 55.000 | 40.750 |
| 56.000 | 40.400 |
| 57.000 | 40.050 |
| 58.000 | 39.700 |
| 59.000 | 39.350 |
| °De | °Rø |
|---|---|
| 60.000 | 39.000 |
| 61.000 | 38.650 |
| 62.000 | 38.300 |
| 63.000 | 37.950 |
| 64.000 | 37.600 |
| 65.000 | 37.250 |
| 66.000 | 36.900 |
| 67.000 | 36.550 |
| 68.000 | 36.200 |
| 69.000 | 35.850 |
| 70.000 | 35.500 |
| 71.000 | 35.150 |
| 72.000 | 34.800 |
| 73.000 | 34.450 |
| 74.000 | 34.100 |
| 75.000 | 33.750 |
| 76.000 | 33.400 |
| 77.000 | 33.050 |
| 78.000 | 32.700 |
| 79.000 | 32.350 |
Delisle to Rømer Conversion
Converting Delisle (°De) to Rømer (°Rø) is a common temperature conversion. 1 °De equals 59.65 °Rø. For example, 100 °De is equal to 25 °Rø.
Quick Mental Math: Delisle to Rømer
Divide by 2.86 to convert delisle to romer.
Why is converting Delisle to Rømer tricky?
The conversion factor requires careful attention to avoid reversing the operation.
Reference Temperatures
Absolute zero: 559.725 °De = -135.90375 °Rø. Water freezing point: 150 °De = 7.5 °Rø. Room temperature: 120 °De = 18 °Rø. Body temperature: 94.5 °De = 26.925 °Rø. Water boiling point: 0 °De = 60 °Rø.
What is Delisle?
Delisle (°De) is a unit of temperature. The Delisle scale measures temperature with zero at the boiling point of water and increasing values downward. One degree Delisle equals 2/3 of a degree Celsius, making it inversely proportional to Celsius. This scale is now mostly historical and not used in modern thermometry [cgpm-resolutions]. Invented by Joseph-Nicolas Delisle in 1732, the scale was devised for scientific observations in Russia. It fixed 0 °De at 100 °C (water boiling point) and increased toward freezing point, opposite to Celsius. The scale fell out of use in favor of Celsius and Kelvin as international standards emerged [cgpm-resolutions]. The Delisle scale is obsolete and retained only in historical scientific texts and specialized archival references. Modern temperature measurements universally use Celsius, Fahrenheit, or Kelvin. Organizations like BIPM do not recognize Delisle for current temperature calibration [bipm-si-brochure].
What is Rømer?
Rømer (°Rø) is a unit of temperature. The Rømer scale is an early temperature scale where water freezes at 7.5 °Rø and boils at 60 °Rø. It was devised to improve temperature measurement accuracy using mercury thermometers. One degree Rømer equals approximately 1.25 degrees Celsius [cgpm-resolutions]. Ole Christensen Rømer introduced this scale in 1701 to standardize temperature readings using mercury thermometers. It influenced later scales such as Celsius and Fahrenheit, representing an important step in temperature measurement history [cgpm-resolutions]. The Rømer scale is obsolete and used only for historical study. It has no current application in science or industry but remains significant in the chronology of temperature scale development [cgpm-resolutions].
Common Misspellings
People often search for this conversion using these alternate spellings: Delislee, Delisleu, Delisell, Delislee scale, Delisle temperature, romer scale, roemer, romer temperature, römer. All of these refer to the Delisle to Rømer conversion.