Today it is only of historical significance. He learned philosophy in the Jesuits‘ college at Poitiers, and in 1699 went to Bourges to study civil law and mathematics. Enjoy! Its unit is represented with °Ré, with °Re, and sometimes with °r after the value. The boiling point of water is 100 °C. Use of the Réaumur scale was once widespread, but by the late 19th century it had been supplanted by other systems. Mercurial thermometers, the stems of which are graduated into eighty equal parts between the freezing and boiling points of water, are not Réaumur thermometers in anything but name. The Réaumur scale, named after René Antoine Ferchault de Réaumur places water freezing point at 0 °Ré and water boiling point at 80 °Ré. © 1997-2021 LUMITOS AG, All rights reserved, https://www.chemeurope.com/en/encyclopedia/R%C3%A9aumur_scale.html, Your browser is not current. The boiling point of water is 100 °C. The scale was used some parts of Europe until the mid-19th century, and in parts of Russia until the early 20th century. The thermometer was filled to the zero mark with a solution of alcohol and water at the temperature of the freezing point of water. René- Antoine Ferchault de Réaumur, * 28.02.1683, La Rochelle, † 18.10.1757, French biologist and physicist Temperature degree scales comparison Temperature conversion chart - table of comparison Kelvin, Réaumur, and Rankine a °C = (4/5)a °Réaumur = [32 + (9/5)a] °F The Réaumur temperature scale is also known as the octogesimal division (division octogesimale in French).. Réaumur’s thermometer was constructed on the principle of taking the freezing point of water as 0°, and graduating the tube into degrees each of which was one-thousandth of the volume contained by the bulb and tube up to the zero mark. Why 80 - because it was possible to bisect 4 times, and all the time receives an integer. Hence, for converting a temperature expressed in degrees Réaumur to degrees Celsius one multiplies the temperature in degrees Réaumur by 1.25 (In formula: °C = 1.25 × °R). Celsius. The Celsius or centigrade temperature scale is based on the water tristate, placing the 0 at the point when the liquid water becomes ice, and the 100 at the point when the liquid water becomes gas, both at 1 atm pressure. Convert Celsius (°C) to Réaumur (°Ré) and Réaumur (°Ré) to Celsius (°C) Formula's used in the conversions: °Ré * 1.25 = °C °C * 0.8; = °Ré Celsius to Réaumur. Simple Celsius to Farenheit conversion Detailed Celsius, Fahrenheit, Kelvin, Réaumur, and Rankine Conversion The Réaumur scale (°Ré, °Re, °R), also known as the "octogesimal division", is a temperature scale in which the freezing and boiling points of water are set to 0 and 80 degrees respectively. The Réaumur scale also known as the "octogesimal division", is a temperature scale in which the freezing and boiling points of water are set to 0 and 80 degrees respectively. The scale is named after René Antoine Ferchault de Réaumur, who first proposed something similar in 1730. Comparison of temperature scales; Comment Kelvin Celsius Fahrenheit Rankine Delisle Newton Réaumur Rømer; Absolute zero: 0.00 −273.15 −459.67 0.00 559.73 −90.14 −218.52 −135.90 Lowest recorded surface temperature on … It is defined as having the freezing point of water as 0° and the boiling point of water as 80°. Our editors will review what you’ve submitted and determine whether to revise the article. The Celsius temperature scale is now defined in terms of the kelvin, with 0 °C corresponding to 273.15 kelvins, approximately the melting point of water under ordinary conditions. to geometry, was nominat… Réaumur was born on February 28, 1683 as son of a judge into a prominent La Rochelle family and educated in Paris. The cupola furnace , still the most economical and generally used process for melting gray iron, was first built by Réaumur in 1720. However his scale as initially proposed Symbol: °F Description: It takes divisions between the freezing point of a solution of ammonium chloride (which is assigned zero value) and the human body's normal temperature (assigned to value 100). It was very fashionable among the French. It also a great tool for learning and understanding chord construction and soloing. While every effort has been made to follow citation style rules, there may be some discrepancies. Réaumur. Updates? Using the stated formula, you first multiply the Celsius scale temperature reading by nine-fifths and get a result of 180. In 1730 René Antoine Ferchault de Réaumur, a distinguished French scientist, proposed a scale that depended on only one endpoint, the freezing point of water, which was taken as zero. The Réaumur (°Re) temperature scale (or octogesimal division) was widely used in parts of Europe in the 18th and 19th centuries; it later was used primarily to measure the temperature of mixtures during brewing, of syrups in the production of certain food products, and of milk…. The freezing point is 0 °C. Réaumur scale (Réaumur, °Ré, °Re) Was created by René Antoine Ferchault de Réaumur in 1730. Actually the freezing point of water - 0 ° Re, the boiling point of water 80 ° Re. 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