## The Kelvin

The kelvin is the SI unit of measurement for temperature. It is one of the seven base units and is assigned the unit symbol K. 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 reference point that defines the Kelvin scale is the triple point of water at 273.16 K. The kelvin is defined as 1/273.16 of the difference between these two reference points, and 1K = 1 Degree Celsius.

We can associate with each temperature a wavelength of electromagnetic radiation.