Lord Kelvin invented the Kelvin Scale in 1848 used on thermometers
. The Kelvin Scale measures the ultimate extremes of hot and cold. Kelvin developed the idea of absolute temperature
, what is called the "Second Law of Thermodynamics", and developed the dynamical theory of heat.
In the 19th century, scientists were researching what was the lowest temperature possible. The Kelvin scale uses the same units as the Celcius scale, but it starts at ABSOLUTE ZERO, the temperature at which everything including air freezes solid. Absolute zero is O K, which is - 273°C degrees Celsius.
Lord Kelvin - Biography
Sir William Thomson, Baron Kelvin of Largs, Lord Kelvin of Scotland (1824 - 1907) studied at Cambridge University, was a champion rower, and later became a Professor of Natural Philosophy at the University of Glasgow. Among his other achievements was the 1852 discovery of the "Joule-Thomson Effect" of gases and his work on the first transatlantic telegraph
cable (for which he was knighted), and his inventing of the mirror galvanometer used in cable signaling, the siphon recorder, the mechanical tide predictor, an improved ship's compass.