Fahrenheit
Thermometer scale in which the freezing point of water is 32°F and the boiling point of water 212°F.
The Fahrenheit scale is still obstinately in use in the US.
This anachronism requires conversion from Centigrade (°C) to Fahrenheit (°F), and vice versa.
One degree °C = (5/9)(°F - 32).
One degree °F = (9/5)(°C) + 32. Named for Gabriel Fahrenheit, a German-Dutch physicist, who devised the scale in 1724. 0°F was the lowest temperature that Fahrenheit could obtain using a mixture of ice and salt.