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Learn how to convert temperatures among eight different scales, including Fahrenheit, Celsius, Kelvin and Rankine. Find the formulas and comparisons for each scale and their historical origins.
The kelvin is the SI unit of temperature, defined as the Celsius scale plus 273.15. Learn about the origin, history and conversion of the kelvin scale, and its relation to absolute zero and the Boltzmann constant.
The Rankine scale is an absolute scale of thermodynamic temperature named after Macquorn Rankine. It is used in engineering systems where heat computations are done using degrees Fahrenheit, and one Rankine degree is equal to one Fahrenheit degree.
Learn about the different methods and principles of calibrating the physical quantity temperature in metrology. Compare empirical and absolute temperature scales, and their applications and limitations.
Temperature is a physical quantity that measures the hotness or coldness of a substance. Learn about different temperature scales, such as Celsius, Fahrenheit and Kelvin, and how temperature affects various processes and phenomena.
Learn how thermodynamic temperature is defined in terms of a macroscopic Carnot cycle and how it relates to the kinetic energy of free particle motion. Find out the difference between thermodynamic temperature and SI temperature, and the significance of absolute zero and the Boltzmann constant.
With the Fahrenheit and Celsius scales now both defined by the kelvin, this relationship was preserved, a temperature interval of 1 °F being equal to an interval of 5 ⁄ 9 K and of 5 ⁄ 9 °C. The Fahrenheit and Celsius scales intersect numerically at −40 in the respective unit (i.e, −40 °F ≘ −40 °C).
Learn about the degree symbol °, used for Celsius and other temperature scales, and the difference between kelvin and degree. Find out how to convert between Celsius, Fahrenheit and kelvin, and see examples of temperature conversions.