Convert Rankine to Reaumur

The Rankine scale was developed by the Scottish engineer and physicist William John Macquorn Rankine in the 19th century, specifically in 1859. Rankine created this scale to provide an absolute temperature scale using Fahrenheit's temperature divisions, making it particularly useful for thermodynamic calculations in engineering and physics. The Rankine scale is still used in some fields, particularly in the United States for thermodynamic calculations in engineering applications, though the Kelvin scale is more widely used internationally in scientific contexts.

The Réaumur scale was developed by the French scientist René Antoine Ferchault de Réaumur in 1730. Réaumur created this scale based on the properties of water and the idea of dividing the temperature range between freezing and boiling points into 80 intervals, making it convenient for use in industries like brewing and metallurgy. The scale was once widely used in Europe, particularly in France, Germany, and parts of Russia. However, it was eventually supplanted by the Celsius scale, which became more universally adopted due to its simplicity and consistency with the metric system. Despite this, the Réaumur scale is still of historical interest and is sometimes used in specialized fields such as certain aspects of thermometry and scientific research.