Kelvin

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Kelvin (unit)

Kelvin (symbol: K) is the base unit of temperature in the International System of Units (SI). It is named after the Scottish physicist William Thomson, 1st Baron Kelvin who made significant contributions to the field of thermodynamics.

Pronunciation

Kelvin is pronounced as /ˈkɛlvɪn/.

Etymology

The term "Kelvin" is derived from the name of the British physicist and engineer, William Thomson, who was ennobled as Baron Kelvin of Largs in 1892. He is known for his work in the mathematical analysis of electricity and formulation of the first and second laws of thermodynamics.

Definition

The Kelvin is defined by setting the fixed numerical value of the Boltzmann constant (k) to 1.380649×10−23 J⋅K−1, where the energy is specified in terms of Joule, a unit of energy in the International System of Units.

Related Terms

  • Absolute zero: The lowest possible temperature, 0 Kelvin, at which the motion of particles that constitutes heat would be minimal. It is equivalent to -273.15 degrees Celsius.
  • Thermodynamic temperature: A measure of the average kinetic energy of the particles in a system, expressed in units of Kelvin.
  • Celsius: A scale and unit of measurement for temperature. It is named after the Swedish astronomer Anders Celsius. The degree Celsius (symbol: °C) can refer to a specific temperature on the Celsius scale as well as serve as a unit increment to indicate a temperature interval (a difference between two temperatures or an uncertainty).

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