Kelvin | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-08

This is an audio version of the Wikipedia Article:
Kelvin


00:01:41 1 History
00:04:06 2 Usage conventions
00:06:05 2.1 Use in conjunction with degrees Celsius
00:07:18 3 2018 redefinition
00:09:30 4 Practical uses
00:09:39 4.1 Colour temperature
00:10:57 4.2 Kelvin as a unit of noise temperature
00:11:29 5 Unicode character
00:12:16 6 See also
00:12:34 7 Notes and references
00:12:43 8 External links



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SUMMARY
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The Kelvin scale is an absolute thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics.  The kelvin (symbol: K) is the base unit of temperature in the International System of Units (SI).
Until 2018, the kelvin was defined as the fraction ​1⁄273.16 of the thermodynamic temperature of the triple point of water (exactly 0.01 °C or 32.018 °F). In other words, it is defined such that the triple point of water is exactly 273.16 K.
On 16 November 2018, a new definition was adopted, in terms of a fixed value of the Boltzmann constant.  For legal metrology purposes, the new definition will officially come into force 20 May 2019 (the 130th anniversary of the Metre Convention).
The Kelvin scale is named after the Belfast-born, Glasgow University engineer and physicist William Thomson, 1st Baron Kelvin (1824–1907), who wrote of the need for an "absolute thermometric scale". Unlike the degree Fahrenheit and degree Celsius, the kelvin is not referred to or written as a degree. The kelvin is the primary unit of temperature measurement in the physical sciences, but is often used in conjunction with the degree Celsius, which has the same magnitude. The definition implies that absolute zero (0 K) is equivalent to −273.15 °C (−459.67 °F).