Why only positive numbers are needed to record temperature in and degK?

Temperature in Kelvin (K) is an absolute scale, meaning it starts at absolute zero, the theoretical point where all molecular motion ceases, which is 0 K. Since temperatures cannot fall below absolute zero, only positive numbers are used in this scale. This is in contrast to other scales like Celsius or Fahrenheit, which can include negative numbers, as they are relative scales based on the freezing and boiling points of water.