What is the Fahrenheit ?

Source: citizendium.org

" The Fahrenheit scale is a temperature scale named after the German physicist Daniel Gabriel Fahrenheit (1686 − 1736), who proposed it in 1724. The symbol of a degree Fahrenheit is °F and the scale has now been largely replaced by the Celsius scale although it is still in use for non-scientific purposes in the United States.
In the Fahrenheit scale, the melting point of water (i.e., ice) at an atmospheric pressure of 101.325 kPa is 32 degrees Fahrenheit (°F) and (...) "