Delisle to Rømer (°De to °Rø) Converter
1 Delisle equals 59.65 Rømer (1 °De = 59.65 °Rø). Convert Delisle to Rømer with formula, table, and examples.
To convert Delisle to Romer, use the formula: Ro = 60 - De x 7/20. The Delisle scale runs backwards compared to most temperature scales, with higher numbers indicating colder temperatures. 0 Delisle (boiling) = 60 degrees Romer, 150 Delisle (freezing) = 7.5 degrees Romer.
How to Convert Delisle to Rømer
- Convert to Kelvin: K = 373.15 - °De * 2 / 3
- Convert to Rømer: °Rø = (K - 273.15) * 21 / 40 + 7.5
- Read the result in Rømer
Good to Know About Delisle to Rømer Conversion
The Romer and Delisle scales are connected through the history of thermometry's development. Romer (1701) influenced Fahrenheit (1724), who influenced the broader tradition that Delisle (1732) contributed to. The conversion between Romer and Delisle connects two early thermometric experiments that, together with Celsius (1742) and Fahrenheit, defined the scientific understanding of temperature measurement in the 18th century.
Delisle to Rømer: What You Need to Know
This conversion bridges the 18th-century Russian-adopted Delisle scale with the Romer scale. Historical Russian temperature records from the era of Catherine the Great and earlier require this conversion for comparison with modern scientific data expressed in Romer units.
What is a Delisle? °De
A historical inverted temperature scale invented by Joseph-Nicolas Delisle in 1732. Water boils at 0 °De and freezes at 150 °De. Higher numbers mean colder temperatures.
Learn more about Delisle →What is a Rømer? °Rø
A temperature scale proposed by Ole Christensen Rømer in 1701. Water freezes at 7.5 °Rø and boils at 60 °Rø. It influenced Fahrenheit's scale development.
Learn more about Rømer →Going the other way? Use our Rømer to Delisle converter.
Delisle to Rømer FAQ
-
Use the formula Ro = 60 - De x 7/20. 0 Delisle (boiling) = 60 degrees Romer, 150 Delisle (freezing) = 7.5 degrees Romer.
-
Delisle measured how far below the boiling point a temperature was. Higher numbers meant further from boiling, which means colder. This inverted logic was logical for his laboratory work but confusing for everyday use.
-
When interpreting historical Russian scientific records from the 18th-19th centuries and converting them to Romer for modern analysis or comparison.
Non-Frequently Asked Questions About Delisle to Rømer
Questions nobody should ask - but someone did.
-
Ole Romer created his scale around 1701 in Denmark, about 31 years before Delisle published his. Romer died in 1710, so he never saw the Delisle scale. But Romer's scale influenced both Fahrenheit (who visited Romer) and indirectly the broader thermometric tradition that Delisle worked within. The scales are intellectual cousins even if their creators never met.
-
It competes with the Newton scale for that distinction. Romer's scale was used briefly in Denmark and influenced Fahrenheit's design, but it was never widely adopted. Its most significant legacy is historical: Fahrenheit learned about thermometry from Romer, then created the scale that would dominate America for centuries. Romer is the teacher everyone forgot while celebrating the student.
-
Water freezes at 7.5 degrees Romer - not at zero, not at a round number, but at seven and a half. Romer chose this because he calibrated his thermometer using a brine solution that froze at 0 degrees Romer. Pure water's freezing point of 7.5 was simply where it fell on his scale. Fahrenheit borrowed this brine-zero concept, which is why water freezes at the equally arbitrary 32 degrees Fahrenheit.
Related Articles About Delisle to Rømer
Need the reverse? Use our Rømer to Delisle converter. See all Temperature converters.