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Converting units of temperature differences (also referred to as temperature deltas) is not the same as converting absolute temperature values, and different formulae must be used. To convert a delta temperature from degrees Fahrenheit to degrees Celsius, the formula is {ΔT} °F = 9 / 5 {ΔT} °C.
The Rankine scale is used in engineering systems where heat computations are done using degrees Fahrenheit. [3] The symbol for degrees Rankine is °R [2] (or °Ra if necessary to distinguish it from the Rømer and Réaumur scales). By analogy with the SI unit kelvin, some authors term the unit Rankine, omitting the degree symbol. [4] [5]
conversion to kelvin combinations SI: kelvin: K K ... degree Rankine °R (R) °R ([°R]/1.8) ... degree Fahrenheit °F (F) °F
Common scales of temperature measured in degrees: Celsius (°C) Fahrenheit (°F) Rankine (°R or °Ra), which uses the Fahrenheit scale, adjusted so that 0 degrees Rankine is equal to absolute zero. Unlike the degree Fahrenheit and degree Celsius, the kelvin is no longer referred to or written as a degree (but was before 1967 [1] [2] [3]). The ...
The degree Celsius (°C) can refer to a specific temperature on the Celsius scale as well as a unit to indicate a temperature interval (a difference between two temperatures). From 1744 until 1954, 0 °C was defined as the freezing point of water and 100 °C was defined as the boiling point of water, both at a pressure of one standard atmosphere.
degree Delisle °De [K] = 373.15 − [°De] × 2 ⁄ 3: degree Fahrenheit °F [°F] ≡ [°C] × 9 ⁄ 5 + 32 [K] ≡ ([°F] + 459.67) × 5 ⁄ 9: degree Newton °N [K] = [°N] × 100 ⁄ 33 + 273.15 degree Rankine °R; [°R] ≡ [K] × 9 ⁄ 5 [K] ≡ [°R] × 5/9 degree Réaumur °Ré [K] = [°Ré] × 5 ⁄ 4 + 273.15 degree Rømer °Rø
In the United States, the Fahrenheit scale is the most widely used. On this scale the freezing point of water corresponds to 32 °F and the boiling point to 212 °F. The Rankine scale, still used in fields of chemical engineering in the US, is an absolute scale based on the Fahrenheit increment.
Annex A of ISO 31-4 lists units of heat based on the foot, pound and second and some other units, including the degree Rankine, degree Fahrenheit, British thermal unit and others. Annex B lists conversion factors for three versions of the calorie .