The Kelvin scale is an absolute temperature scale used primarily in scientific contexts. It is defined in such a way that there are no negative values and the lowest possible temperature, known as absolute zero, is 0 K (Kelvin).
Unlike Celsius or Fahrenheit, which have degrees, the Kelvin scale measures temperature based on absolute values. This means that it reflects the thermal energy of particles directly without using any arbitrary reference points, like the freezing or boiling points of water.
For example, where 0°C corresponds to the freezing point of water and 100°C corresponds to its boiling point, 0 K is where all molecular motion ceases, marking the theoretical limit of how cold a physical system can get.
Consequently, when referring to temperature in Kelvin, we simply use the term ‘Kelvin’ without the degree symbol, maintaining consistency with its absolute nature. So, instead of saying 100 degrees Kelvin, we simply say 100 K.