# Rømer to Réaumur (°Rø to °Ré) Source: https://www.unitconvertercalculator.com/temperature/romer-to-reaumur/ To convert Romer to Reaumur, use the formula: Re = (Ro - 7.5) x 32/21. The Romer scale is the early Danish scale that influenced Fahrenheit, while the Reaumur scale is the historical European scale once standard in France and Germany. Water freezes at 7.5 degrees Ro (0 Re) and boils at 60 degrees Ro (80 Re). ## Formula °Rø via Kelvin to °Ré ## Conversion Table | Rømer (°Rø) | Réaumur (°Ré) | |---|---| | -10 °Rø | -26.666666666664 °Ré | | 0 °Rø | -11.428571428568 °Ré | | 5 °Rø | -3.80952380952 °Ré | | 7.5 °Rø | 0 °Ré | | 10 °Rø | 3.80952380952 °Ré | | 15 °Rø | 11.428571428568 °Ré | | 20 °Rø | 19.047619047616 °Ré | | 25 °Rø | 26.666666666664 °Ré | | 30 °Rø | 34.285714285712 °Ré | | 40 °Rø | 49.523809523808 °Ré | | 50 °Rø | 64.761904761904 °Ré | | 60 °Rø | 80 °Ré | | 80 °Rø | 110.47619047619 °Ré | | 100 °Rø | 140.95238095238 °Ré | | 200 °Rø | 293.33333333334 °Ré | ## Units ### 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. ### Réaumur (°Ré) A historical temperature scale where water freezes at 0 °Ré and boils at 80 °Ré. Named after René Antoine Ferchault de Réaumur. Once widely used in Europe. ## Background The Romer scale was created by Ole Romer, Danish astronomer, around 1701, influenced Fahrenheit. The Reaumur scale was created by Rene Antoine Ferchault de Reaumur, 1730, once widespread in continental Europe. Converting between them bridges different eras and different measurement philosophies in the history of thermometry. ## Good to Know The history of temperature measurement is the history of scientific collaboration and competition across borders. The Romer scale (influenced Fahrenheit) and the Reaumur scale (once widespread in continental Europe) represent different national contributions to solving the same fundamental problem: how to assign numbers to the sensation of hot and cold. ## FAQ ### How do you convert Romer to Reaumur? Use the formula Re = (Ro - 7.5) x 32/21. At the freezing point of water: 7.5 Ro = 0 Re. At the boiling point: 60 Ro = 80 Re. ### When would you need to convert Romer to Reaumur? This conversion is needed when interpreting historical scientific records, comparing temperature data across different measurement traditions, or completing engineering calculations that mix temperature scales from different national standards. ### What are the key reference points for both scales? Water freezes at 7.5 Ro = 0 Re. Water boils at 60 Ro = 80 Re. These two fixed points anchor both scales and provide easy verification of any conversion calculation. ## Non-Frequently Asked Questions ### What everyday temperature feels the same whether you measure it in Romer or Reaumur? Every temperature feels the same regardless of the scale you use to describe it. A comfortable room is comfortable whether you call it by its Romer or Reaumur value. Temperature scales change the number, not the physics. Your skin cannot tell the difference between measurement systems. ### Is converting Romer to Reaumur a skill anyone puts on their resume? Unless you are applying to work in a museum of scientific instruments or writing the world's most comprehensive conversion website, this particular skill would raise more questions than it answers in a job interview. But it does demonstrate attention to detail and a fondness for completeness - qualities any employer should appreciate. ### What would happen if weather apps added Romer and Reaumur to their display? Weather apps already struggle to present temperature clearly in one or two scales. Adding Romer and Reaumur would turn a simple forecast into a mathematics lecture. Users would see five or more numbers for the same temperature, causing decision paralysis about whether to bring a jacket. 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