The Kelvin

Lord kelvin was one of the first physicists to recognize the importance of an absolute scale to use when measuring temperatures. An absolute measure using absolute zero as zero. As he at the time was using celsius units to measure the change in temperature. thus we end up with the historical method of the kelvin scale, this being 0 is equal to the absolute coldest temperature that an object can reach, and the degrees proceeding at a rate that is the same as the celsius scale which is based on the 2 points of water freezing at 0 degrees, and boiling at 100 degrees.

Since then we have modified our definition of the kelvin scale to use the triple point of water, and the absolute zero point, as reference points.