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Fahrenheit

The Fahrenheit scale () is a temperature scale based on one proposed in 1724 by the European physicist Daniel Gabriel Fahrenheit (1686???1736). It uses the degree Fahrenheit (symbol: ??F) as the unit. Several accounts of how he originally defined his scale exist, but the original paper suggests the lower defining point, 0 ??F, was established as the freezing temperature of a solution of brine made from a mixture of water, ice, and ammonium chloride (a salt). The other limit established was his best estimate of the average human body temperature, originally set at 90 ??F, then 96 ??F (about 2.6 ??F less than the modern value due to a later redefinition of the scale). For much of the 20th century, the Fahrenheit scale was defined by two fixed points with a 180 ??F separation: the temperature at which pure water freezes was defined as 32 ??F and the boiling point of water was defined to be 212 ??F, both at sea level and under...

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wikidata.org 0 views · 2024-12-26 21:59:02