Fahrenheit (symbol °F) is a Pre Astro Terran temperature scale based on one proposed in 1724 by the physicist Daniel Gabriel Fahrenheit (1686–1736), after whom the scale is named.[1] Within this scale, the freezing of water into ice is defined at 32 degrees, while the boiling point of water is defined to be 212 degrees—on Fahrenheit's original scale the freezing point of brine was zero degrees.

By the end of the 20th century, most countries on Earth used the Celsius scale rather than the Fahrenheit scale, though Canada retained it as a supplementary scale that could be used alongside Celsius. Fahrenheit remained the official scale for the following countries: United States, Cayman Islands, Palau, Bahamas and Belize. The Rankine temperature scale was based upon the Fahrenheit temperature scale, with its zero representing absolute zero instead.

Fahrenheit temperature conversion formulae

Name from Fahrenheit to Fahrenheit
Celsius [°C] = ([°F] − 32) × 5⁄9 [°F] = [°C] × 9⁄5 + 32
Kelvin [K] = ([°F] + 459.67) × 5⁄9 [°F] = [K] × 9⁄5 − 459.67
Rankine [°R] = [°F] + 459.67 [°F] = [°R] − 459.67

For temperature intervals rather than specific temperatures, 1 °F = 1 °R = 5⁄9 °C = 5⁄9 K

Only a few of the planets who's original colonists came from one of the six mentioned above still use Fahrenheit on a regular basis outside of "history of science" type classes.

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