The Kelvin scale is an absolute temperature scale where zero Kelvin (0 K) corresponds to absolute zero, the theoretical lowest possible temperature where all molecular motion ceases. Since the Kelvin scale doesn't have negative values, there is no need to use degrees to represent temperatures on this scale.
The Celsius and Fahrenheit scales, on the other hand, are relative temperature scales where zero degrees Celsius (0 °C) and zero degrees Fahrenheit (0 °F) correspond to specific points in the freezing and boiling points of water, respectively. These scales use degrees to indicate the deviation from these reference points.
When working with the Kelvin scale, the temperature is simply expressed as a number, without the need for degrees. For example, a temperature of 100 Kelvin would be written as 100 K.
The Kelvin scale is commonly used in scientific and engineering contexts, particularly in situations where precise and absolute temperature measurements are required. It is particularly useful in fields such as physics, chemistry, and thermodynamics.