A handful of British Overseas Territories, including the Virgin Islands, Montserrat, Anguilla, and Bermuda, still use both scales. Fahrenheit is used alongside the Celsius scale in Antigua and Barbuda and other countries which use the same meteorological service, such as Saint Kitts and Nevis, the Bahamas, and Belize. It continues to be officially used in the United States (including its unincorporated territories), its freely associated states in the Western Pacific ( Palau, the Federated States of Micronesia and the Marshall Islands), the Cayman Islands, and the former American colony of Liberia. It is now formally defined using the Kelvin scale and hence ultimately by the Boltzmann constant, the Planck constant, and the second (defined as a specific number of cycles of the unperturbed ground-state hyperfine transition frequency of the caesium-133 atom.) įor much of the 20th century, the Fahrenheit scale was defined by two fixed points with a 180 ☏ separation: the temperature at which pure water freezes was defined as 32 ☏ and the boiling point of water was defined to be 212 ☏, both at sea level and under standard atmospheric pressure. The other limit established was his best estimate of the average human body temperature, originally set at 90 ☏, then 96 ☏ (about 2.6 ☏ less than the modern value due to a later redefinition of the scale). Several accounts of how he originally defined his scale exist, but the original paper suggests the lower defining point, 0 ☏, was established as the freezing temperature of a solution of brine made from a mixture of water, ice, and ammonium chloride (a salt). It uses the degree Fahrenheit (symbol: ☏) as the unit. The Fahrenheit scale ( / ˈ f æ r ə n ˌ h aɪ t, ˈ f ɑː r-/) is a temperature scale based on one proposed in 1724 by the physicist Daniel Gabriel Fahrenheit (1686–1736).

Thermometer with Fahrenheit (marked on outer bezel) and Celsius (marked on inner dial) degree units.

F to c formula