degree Fahrenheit
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https://doi.org/10.1351/goldbook.D01562
Non-SI unit of Fahrenheit temperature, °F = 5/9 K. The Fahrenheit temperature is related to the Celsius temperature by θF/°F = 9/5.(θ/°C) + 32.
Source:
Green Book, 2
nd
ed., p. 113 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)