Celsius is a scale an unit o meisurment for temperatur . As an SI derived unit , it is uised bi maist kintras in the warld. It is named efter the Swadish astronomer Anders Celsius (1701?1744), wha developed a seemilar temperatur scale. The degree Celsius ( °C ) can refer tae a speceefic temperatur on the Celsius scale as well as a unit tae indicate a temperatur interval , a difference atween twa temperaturs or an uncertainty .