Fahrenheit scale (Fahrenheit temperature scale) notation ℉, 1724, the German Wallenheit developed the Fahrenheit scale, he set the temperature of a certain concentration of brine solidification at 0℉, the temperature of pure water solidification at 32 ℉, The boiling temperature at standard atmospheric pressure was set at 212 ° F, divided into 180 equal parts, each representing 1 degree, and this was the temperature scale in Fahrenheit.