BIPM, and with that most of the world, adopted the Kelvin scale (defined by the absolute zero and the triple point of water) as the temperature scale (adopted by CGPM-9). The modern Celsius scale is known to be based on the triple point of the Vienna Standard Mean Ocean Water, and also on the concept of absolute zero. Invented in 1742 by the Swedish astronomer Anders Celsius, it is sometimes called the centigrade scale because of the 100-degree interval between the defined points. The Celsius scale, also known as the centigrade scale, is a temperature scale based on 0o for the freezing point of water and 100o for the boiling point of water. The measurements are then made in degrees Celsius (° C). [a] Celsius Scale:-Celsius was formerly called Centigrade. These are, the melting point of pure ice, which gives us the lower fixed point of the scale and the boiling point of pure water (at atmospheric pressure) which gives us the upper fixed point. So the Kelvin scale is absolute in the sense that one of the reference points is set by the laws of physics as the actual 0. Retrieved from https://www.thoughtco.com/definition-of-celsius-temperature-scale-605837. Proper Format for Recording a Celsius Measurement. 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