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English: Cooling curves of chocolate at different degrees of temper, as a temper meter would record them. The Y axis shows the temperature in degrees centigrade; the X axis the progress of time, without units. This is a schematic diagram, illustrating the three basic shapes one would expect: (a) under-tempered; (b) well-tempered; (c) over-tempered.
A cooling curve of naphthalene from liquid to solid. A cooling curve is a line graph that represents the change of phase of matter, typically from a gas to a solid or a liquid to a solid. The independent variable (X-axis) is time and the dependent variable (Y-axis) is temperature. [1] Below is an example of a cooling curve used in castings.
English: The cooling curve and phase diagram of an alloy; in this case a copper/nickel alloy. Based on a diagram from Degarmo, E. Paul; Black, J T.; Kohser, Ronald A. (2003), Materials and Processes in Manufacturing (9th ed.), Wiley, ISBN 0-471-65653-4.
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This procedure is known as Computer-Aided Cooling Curve Thermal Analysis. [4] Advanced techniques use differential curves to locate endothermic inflection points such as gas holes, and shrinkage, or exothermic phases such as carbides, beta crystals, inter crystalline copper, magnesium silicide, iron phosphide's and other phases as they solidify.
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The main feature of thermodynamic diagrams is the equivalence between the area in the diagram and energy. When air changes pressure and temperature during a process and prescribes a closed curve within the diagram the area enclosed by this curve is proportional to the energy which has been gained or released by the air.
A "schematic diagram" of global temperature variations over the last thousand years [23] has been traced to a graph based loosely on Lamb's 1965 paper, nominally representing central England, modified by Lamb in 1982. [17] Mike Hulme describes this schematic diagram as "Lamb's sketch on the back of an envelope", a "rather dodgy bit of hand ...