The Fahrenheit scale is a temperature scale based on three fixed points: the lowest temperature achieved by a frigorific mixture of ice, water, and salt (0 °F), the temperature of still water when ice was just beginning to form (32 °F), and the average human body temperature (98.6 °F).
The Fahrenheit scale was the primary temperature standard for climatic, industrial, and medical purposes in English-speaking countries until the 1970s, and it is still used in the United States for non-scientific applications. However, it has been mostly replaced by the Celsius scale in the rest of the world[4].
The Fahrenheit scale is in common use in the United States. Water freezes at 32 degrees Fahrenheit and boils at 212 degrees Fahrenheit. The Fahrenheit scale is still used for non-scientific applications in the United States. Daniel Gabriel Fahrenheit’s inventions ushered in the first revolution in the history of thermometry and laid the foundations for the era of precision thermometry.
Citations:
[1] https://en.wikipedia.org/wiki/Fahrenheit