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Fahrenheit. A temperature scale devised by the German physicist G. D. Fahrenheit on which 32¦ represents the freezing point of water and 212¦ its boiling point under standard atmospheric pressure. General use of this scale is now limited chiefly to the United States, with most other countries having adopted the Celsius scale (q.v.) as the official temperature scale. The latter is used universally for scientific purposes. The interconversions of the Fahrenheit (¦F) and Celsius (¦C) scales are as follows: ¦C = 5/9 (¦F - 32); ¦F = (9/5 x ¦C) , 32.