Degree Fahrenheit °F
About the Degree Fahrenheit
Daniel Gabriel Fahrenheit proposed his scale in 1724. On it water freezes at 32 °F and boils at 212 °F at standard pressure, a span of 180 degrees. The United States uses Fahrenheit for weather and cooking, and the scales meet at minus 40.
Related Units
Kelvin
KBase unit; k = 1.380649 × 10⁻²³ J/K exactly
The kelvin is defined by fixing the Boltzmann constant at exactly 1.380649 × 10⁻²³ joules per kelvin. Before 2019 it...
Degree Celsius
°Ct/°C = T/K − 273.15
The degree Celsius is equal in size to the kelvin, but its scale is offset so that 0 °C is 273.15 K. It is named after...
Inch
in25.4 mm (exact)
The inch is defined as exactly 25.4 millimetres. Britain and the United States agreed this value in the 1959...
Foot
ft0.3048 m (exact)
The international foot is 12 inches, exactly 0.3048 metres. Aviation altitudes are still given in feet nearly...