Celsius Celsius scale are defined by absolute zero and the triple point of Vienna Standard Mean Ocean Water (VSMOW), a specially purified water. This definition also precisely relates the Celsius scale to the Kelvin scale, which defines the SI base unit of thermodynamic temperature with symbol K. Absolute zero, the lowest temperature possible, is defined as being exactly 0 K and −273.15 °C. The temperature of the triple point of water is defined as exactly . This means that a temperature difference of one degree Celsius and that of one kelvin are exactly the same. In 1742, Swedish astronomer Anders Celsius
Anders Sørensen Vedel Anders Sørensen Vedel Anders Sørensen Vedel (9 November 1542 – 13 February 1616) was a Danish priest and historian. He translated the "Gesta Danorum" by Saxo Grammaticus into Danish in 1575, and published the influential ""Hundredvisebogen"" in 1591. Anders Sørensen was born in Vejle, from which place the Vedel name comes. 14 years old he moved to study in Ribe, and after finishing his education he moved on to Copenhagen University in 1561. In 1562, he was the tutor of astronomer Tycho Brahe on Brahe's Grand Tour in Europe, forming a lasting bond of friendship with him. Vedel started studying