Convert degrees Delisle to degrees Celsius

Explanation

To convert degrees Delisle to degrees Celsius first multiply by 2 and divide by 3 then subtract the result from 100.

Formula

100 − °D × 2 / 3=°C

degrees Delisle°D

dimension	temperature
symbol	°D
search alias	dd

The degree Delisle (°D) is a unit of temperature.

Definition

On the Delisle scale, zero is the boiling point of water and 150 the freezing point.

History

The Delisle scale was invented in 1732 by Joseph-Nicolas Delisle, a French astronomer. He used a mercury thermometer and measured the constraction of the fluid from the temperature of boiling water that was chosen as the zero point.

In 1738, Josias Weitbrecht, a german professor of anatomy, recalibrated the scale, keeping zero for the boiling point of water and adding 150 for the freezing point.

The Delisle scale is therefore inverted, a warmer temperature will have a lower value in degree Delisle.

degrees Celsius°C

dimension	temperature
symbol	°C
synonyms	degree centigrade
search alias	c

The degree Celsius (°C) is a unit of temperature accepted for use alongside the International System of Units.

Definition

The Celsius scale's zero is equal to 273.15 kelvin and an interval of one degree Celsius equals an interval of one kelvin.

History

In 1742, Anders Celsius, a swedish astronomer, created the centigrade temperature scale. On this scale, the 0 represented the boiling point of water at mean sea level, and 100 the freezing point of water.

In 1743, Jean-Pierre Christin, a French physicist, inverted the scale so that 0 represented the freezing point of water and 100 the boiling point.

And in 1948, the BIPM renamed the centigrade scale the Celsius scale to honor Anders Celsius.