Celsius scale a scale of hotness, or temperature, first established by the Swedish scientist Anders Celsius(1101-1144)in 1142 On this scale, the unit of temperature is the degree Celsius (O; water freezes at 0C and boils at 100C( under agreed standard atmospheric conditions ) although when Celsius originally devised the scale he made o'C the boiling-point and 100C the freezing point. The Celsius scale was formerly commonly known as the centigrade scale because of the 100 divisions between the freezing- and boiling- points of water. To convert from degrees Celsius to degrees Fahrenheit multiply by 9/5 and add 32.Celsius scale a scale of hotness, or temperature, first established by the Swedish scientist Anders Celsius ( 1701- 1744 ) in 1742. On this scale, the unit of temperature is the degree Celsius (℃); water freezes at 0℃ and boils at 100℃ ( under agreed standard atmospheric conditions ), although when Celsius originally devised the scale he made 0℃ the boiling-point and 100℃ the freezing￾point. The Celsius scale was formerly commonly known as the centigrade scale because of the 100 divisions between the freezing- and boiling￾points of water. To convert from degrees Celsius to degrees Fahrenheit multiply by 9/5 and add 32