Fahrenheit is a temperature scale named after the German physicist Daniel Gabriel Fahrenheit (1686?1736), who proposed it in 1724. In this scale, the freezing point of water is 32 degrees Fahrenheit (written "32 °F"), the boiling point is 212 degrees, placing the boiling and freezing points of water exactly 180 degrees apart. On the Celsius scale, the freezing and boiling points of water are exactly 100 degrees apart, thus the unit of this scale, a degree Fahrenheit, is of a degree Celsius. The Fahrenheit scale coincides with the Celsius scale at ?40 °F, which is the same temperature as ?40 °C. Absolute zero is ?459.67 °F. The Rankine temperature scale was invented to use degrees the same size as Fahrenheit degrees, so 0 °R would be absolute zero, namely ?459.67 °F. History There are a few competing versions of the story of how Fahrenheit came to devise his temperature scale. According to Fahrenheit himself in an a

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