Scale of temperature the Swedish astronomer Anders Celsius (1701–1744), who developed a similar temperature scale two years before his death. The degree Celsius (°C) can refer to a specific temperature on the Celsius scale as well as a unit to indicate a temperature "interval "(a difference between two temperatures or an uncertainty). From 1744 until 1954, 0 °C was defined as the freezing point of water and 100 °C was defined as the boiling point of water, both at a pressure of one standard atmosphere. Although these defining correlations are commonly taught in schools today, by international agreement the unit "degree Celsius" and
Wedgwood scale of temperature. He also determined the melting points of three metals, namely copper (27 °W or ), silver (28 °W or ) and gold (32 °W or ). All these values are at least too high. Louis-Bernard Guyton de Morveau used his pyrometer to evaluate the temperature scale of Wedgwood and came to the conclusion that the starting point should be significantly lower, at instead of , and that the steps should be nearly halved from to no more than . However, even after this revision the Wedgwood measurements overestimated the melting points of elements. Wedgwood scale The Wedgwood scale