It is a historical temperature measurement system that divides the temperature range between the freezing and boiling points of water into 80 equal parts. The Réaumur temperature scale is named for René-Antoine Ferchault de Réaumur. The Rankine scale is still used in some engineering calculations involving thermodynamic processes, especially in fields related to heat transfer, fluid dynamics, and energy systems. Rankine begins at absolute zero, so 0 °R is the same as -459.67☏. Rankine's scale is related to the Kelvin scale, where the Kelvin degree is the same size as the Rankine degree.

The Rankine scale was developed in the 19th century by Scottish physicist and engineer William John Macquorn Rankine. It has become an invaluable tool in scientific research and engineering because it provides a universal reference point for measuring temperature that is independent of the properties of any specific material. Lord Kelvin collaborated with other physicists, including James Joule, to refine the Kelvin temperature scale. William Thomson, known as Lord Kelvin, proposed the idea of an absolute temperature scale based on absolute zero, where molecular motion stops. The Kelvin scale is also called the absolute temperature scale. He used the average human body temperature to define 100 degrees on the scale.

In 1724 Fahrenheit created the mercury-in-glass thermometer which had a standardized temperature scale and greater accuracy than existing thermometers.įahrenheit used a specific mixture of ice and salt to define zero degrees on the Fahrenheit scale. The Fahrenheit temperature scale was developed by Polish-German physicist and engineer Daniel Gabriel Fahrenheit.

The Celsius scale is also known as the centigrade scale. Its simplicity with reference points based on the properties of water made it widely adopted and essential for scientific and everyday temperature measurements. It was developed by Swedish astronomer and physicist Anders Celsius in the 18th century.Ĭelsius proposed a temperature scale with 0 degrees as the freezing point of water and 100 degrees as the boiling point of water. Using the Fahrenheit to Celsius formula: Celsius (☌) = (Fahrenheit - 32) / 1.8, these examples show how to convert a temperature in Fahrenheit to Celsius.-218.52 Origins of the Temperature Scales What is Celsius?Ĭelsius is the most widely used temperature scale in the world today. From these dates, it's probable that Anders Celsius invented this conversion formula. Literature indicates that the Fahrenheit scale was invented in 1724 and the Celsius (Centigrade) scale invented in 1742. I am unsure if it was Anders Celsius or Daniel Gabriel Fahrenheit who created this conversion formula. The temperature scales used in this formula were created by Daniel Gabriel Fahrenheit (1686 – 1736), and Anders Celsius (1701–1744). Temperature scales are usually named after the person who created them. If you are using this formula for your own conversions, you can check your result with the Fahrenheit to Celsius calculator. If required, there are worked examples below which use this formula to show how to convert a temperature in Fahrenheit to a temperature in Celsius.Īs with any math calculation and conversion, it's good practice to double check your results.

Formula of farenheit to celcius