Candela unit, the "candela". In 1967 the 13th CGPM removed the term "new candle" and gave an amended version of the candela definition, specifying the atmospheric pressure applied to the freezing platinum: The candela is the luminous intensity, in the perpendicular direction, of a surface of square metre of a black body at the temperature of freezing platinum under a pressure of newtons per square metre. In 1979, because of the difficulties in realizing a Planck radiator at high temperatures and the new possibilities offered by radiometry, the 16th CGPM adopted the modern definition of the candela. The arbitrary (1/683) term
Félix Candela Perpignan Concentration camp in Perpignan, France until the end of the war in 1939. Candela had fought against Franco; therefore he could not stay in the new Spain as long as Franco was the head of state. After his name was selected with a few hundred other prisoners, Candela was put onto a ship bound for Mexico, where he would start his career. Candela married Eladia Martin when he moved to Mexico from Spain; there, they raised a family. In his early life, Felix was active in sports, particularly rugby and skiing. Candela worked very hard during his lifetime to