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Celsius, historically known as centigrade, is a scale and unit of measurement for temperature. It is named after the Swedish astronomer Anders Celsius (1701–1744), who developed a similar temperature scale.
Since the 19th century, the scientific and thermometry communities worldwide referred to this scale as the centigrade scale. Temperatures on the centigrade scale were often reported simply as degrees or, when greater specificity was desired, as degrees centigrade. The symbol for temperature values on this scale is °C.
Fahrenheit (symbol °F) is a temperature scale based on one proposed in 1724 by the German physicist Daniel Gabriel Fahrenheit (1686–1736), after whom the scale is named.
By the end of the 20th century, Fahrenheit was only used as the official temperature scale in the United States, the Bahamas, Belize, the Cayman Islands, and Palau. All other countries in the world now use the Celsius scale, defined since 1954 by absolute zero being -273.15 °C and the triple point of water being at 0.01 °C.
The Conversion between degrees Celsius and degrees Fahrenheit is as follows: Fahrenheit to Celsius : (°F − 32) ÷ 1.8 =°C
Celsius to Fahrenheit : (°C × 1.8) + 32 =°F
