Until the 1970s the Fahrenheit scale was in general common use in the English-speaking countries; the Celsius, or centigrade, scale was employed in most other countries and for scientific purposes worldwide. Since that time, however, most English-speaking countries have officially adopted the Celsius scale. The conversion formula for a temperature that is expressed on the Celsius representation is: F = (9/5 C) + 32.
chem.oswego.edu/chem209/Misc/fahrenheit.htm
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chem.oswego.edu/chem209/Misc/fahrenheit.htm