# Temperature scales

Conversion between different temperature scales

It is time to expand the calculator Celsius to Fahrenheit calculator explained and make a mega-calculator that converts temperature between seven different scales.

We describe them to dispel the darkness of ignorance.

Celsius scale (Celsius, °C)
It is used in everyday life, but not everywhere (remember Fahrenheit). 0 ° - the freezing point of water, 100 ° - the boiling point of water at normal atmospheric pressure. Invented by Anders Celsius in 1742.

Fahrenheit scale (Fahrenheit, °F)
Used in everyday life, but not everywhere, and primarily in the UK and US. Its definition (from Wikipedia) - a temperature scale, where 1 degree (1° F) temperature difference is equal to 1/180 of water boiling point and melting ice at normal atmospheric pressure, and the melting point of ice has a temperature of +32 ° F. Invented by Gabriel Fahrenheit in 1724.

Celsius conversion formula
$C=\frac{5}{9}(F-32)$

Kelvin scale(Kelvin, K)
Not used in everyday life so much. Born from the desire to get the scale of absolute zero (absence of thermodynamic energy).
Named in honor of William Thomson. You may ask - where is Kelvin. William Thomson was Lord Kelvin.
He identified the absolute zero theoretically, and it was -273°C. Well, degree Celsius was accepted for one degree, making the conversion between these two scales trivial. This happened in 1848.

In 1954, on the tenth major conference of Weights and Measures (Conférence Générale des Poids et Mesures, CGPM), it was decided that the fixed point of the Kelvin scale is the triple point of water, and its temperature is 273.16K.

By the way, K is written without a degrees icon since 1968, after the 13th major conference, and degrees after the conference was 1/273.16 temperature of the triple point of water (well, as it is still the same one degree Celsius, but now more scientifically).

Rankine scale (Rankine, °Ra)
The absolute temperature scale for the Fahrenheit like the K for the °C. It was proposed in 1859 by William Rankine. Zero degrees Rankine is -459.67 ° F and 0K (zero degrees Kelvin). Nothing much is measured in this absolute temperature scale as in Kelvin, of course. So the British (Kelvin) defeated the Scots (Rankine).

Delisle scale (Delisle, °De)
Not used for a long time as it once was. Was developed in 1732 by Joseph-Nicolas Delisle. Zero - the boiling point of water and one degree is minus two-thirds of a degree Celsius (because the freezing point of water at that scale 150 ° De)
The count of positive values goes in the opposite direction to that of C
Generally, it is not very surprising - Celsius had the same before, but thermometer makers turned everything upside down.

Celsius conversion formula
$C=100 - De\frac{2}{3}$

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.
Why 80 - because it was possible to bisect 4 times and still receive an integer. It was very fashionable among the French.

Celsius conversion formula
$C=Re\frac{5}{4}$

Rømer scale (Rømer, °Rø)
Invented in 1703 by Dane Ole Rømer. Zero degrees on this scale - the freezing point of the brine. Oh, those Danes. Then he, however, changed his mind and appointed the freezing point of water 7.5 ° Rø. But the boiling point of water - 60 ° Rø.

The formula
$C=(Re-7.5)\frac{40}{21}$

Why all these funny scales are not used? Because when the French invented the metric system, they decided that we need tens and chose Celsius. So he won. And England went its own way (see Shoe size comparison).

How to use the calculator - set the temperature you need to convert, e.g., 100 degrees. Next is the conversion from Celsius to Fahrenheit. Look for Celsius and Fahrenheit intersection in the table - that's your result.

#### Temperature scales

Digits after the decimal point: 2
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PLANETCALC, Temperature scales