The kelvin, symbol K, is the primary unit of temperature in the
International System of Units (SI), used alongside its prefixed forms and the degree Celsius. It is named after the Belfast-born and University of Glasgow-based engineer and physicist William Thomson, 1st Baron Kelvin (1824–1907). The Kelvin scale is an absolute thermodynamic temperature scale, meaning it uses
absolute zero as its zero point.
Historically, the Kelvin scale was developed by shifting the starting point of the much-older Celsius scale down from the melting point of ice to
absolute zero, and its increments still closely
approximate the historic definition of a degree Celsius, but since 2019 the scale has been defined by fixing the Boltzmann constant k to be exactly 1.380649×10−23 J⋅K−1. Hence, one kelvin is equal to a change in the thermodynamic temperature T that results in a change of thermal energy kT by 1.380649×10−23 J. The temperature in degree Celsius is now defined as the temperature in kelvins minus 273.15, meaning that a change or difference in temperature has the same value when expressed in degrees Celsius as in kelvins, and that 0 °C is equal to 273.15 K.
The kelvin is the primary unit of temperature for engineering and the physical sciences, while in most countries Celsius remains the dominant scale outside of these fields. In the
United States, outside of the physical sciences the Fahrenheit scale predominates, with the kelvin or Rankine scale employed for absolute temperature.
One may be blue (a cool color, i.e. higher kelvin
temperature) and the other amber (a warm color, i.e. lower kelvin
temperature). The shell of matter expelled from the star is moving at 4000 km per second; it has a
temperature of 30,000 kelvin on average.