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Lord Kelvin. LOC. 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.
That is why you shake a mercury medical thermometer before and after you use it, to reconnect the mercury and get the thermometer to return to room temperature. Mouth Thermometers In 1612, the Italian inventor Santorio Santorio invented the mouth thermometer and perhaps the first crude clinical thermometer.