Celsius: [19] The notion of a temperature scale based on 100 was developed by the Swedish astronomer Anders Celsius (1701–44) (he originally had water boiling at zero and freezing at 100º, but this was later reversed). His name began to be used to designate the scale in English around the middle of the 19th century. In popular parlance it has usually taken a back seat to centigrade (a French invention, first recorded in English in 1812), but it remains the preferred term in scientific usage.
