Fahrenheit scale a scale of temperature, first established by the German physicist Gabriel Fahrenheit in 1715. The unit of temperature is the degree Fahrenheit ( F), and O F was originally the coldest temperature Fahrenheit could achieve using a freezing mixture of salt and ice On his scale, water freezes at 31F and boils at 212 F(under set atmospheric conditions ).No longer used in scientific work, Fahrenheit temperatures still feature in everyday language hot days in the eighties,, for example To convert a Fahrenheit temperature to Celsius centigrade ) subtract 32, then multiply by 5/9Fahrenheit scale a scale of temperature, first established by the German physicist Gabriel Fahrenheit in 1715. The unit of temperature is the degree Fahrenheit (℉), and 0℉ was originally the coldest temperature Fahrenheit could achieve using a freezing mixture of salt and ice. On his scale, water freezes at 31℉ and boils at 212℉ ( under set atmospheric conditions ). No longer used in scientific work, Fahrenheit temperatures still feature in everyday language; hot days “ in the eighties ”, for example. To convert a Fahrenheit temperature to Celsius ( centigrade ), subtract 32, then multiply by 5/9