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
Time–temperature superposition indicator of the quality of a relationship that has been computed from experimental data. The principle of time-temperature superposition requires the assumption of thermologically simple behavior (all curves have the same characteristic time variation law with temperature). From an initial spectral window ["ω", "ω"] and a series of isotherms in this window, we can calculate the master curves of a material which extends over a broader frequency range. An arbitrary temperature "T" is taken as a reference for setting the frequency scale (the curve at that temperature undergoes no shift). In the frequency range ["ω", "ω"], if the temperature increases