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Fahrenheit scale[′far·ən‚hīt ‚skāl]
a temperature scale in which the temperature range between the melting point of ice and the boiling point of water at standard atmospheric pressure is divided into 180 parts, called degrees Fahrenheit (°F). The melting point of ice is assigned a value of 32°F, and the boiling point of water is assigned a value of 212°F.
The Fahrenheit scale was proposed in 1724 by the German physicist D. G. Fahrenheit (1686–1736). It is traditionally used in a number of countries, particularly the USA.
The formula for converting a temperature on the Fahrenheit scale (tF) to a temperature on the Celsius scale (t) is the following: t = (5/9)(tF – 32°F).