(1) A unit of temperature equal to Kelvin scale temperature of the triple point of water.

(2) The reference points are water freezing or boiling, and the interpolation is linear and then that morphed into the Kelvin scale as we're going to see later.

(3) All right, next time we're going to talk about a much better scale, which is the ideal gas thermometer and how we get to the Kelvin scale.

(4) A unit of temperature equal to 1/273.16 of the Kelvin scale temperature of the triple point of water.

(5) And so redefining then the temperature scale to the Kelvin scale, where t in degrees Kelvin is equal to t in degree Celsius, plus 273.15.