Swedish astronomer, physicist and
mathematician who is famous for the temperature scale he developed.
Celsius was born in Uppsala where he succeeded his father as
professor of astronomy in 1730. It was there also that he built
Sweden's first observatory in 1741.
Celsius' fixed scale for measuring temperature defines zero degrees as the temperature at
which water freezes, and 100 degrees as the temperature at which water boils. This scale, an inverted form of Celsius' original design, was adopted as the
standard and is still used in almost all scientific work.