The absolute temperature divided by an appropriate melting temperature, . It is a useful scale for comparing thermally activated deformation; Celsius temperatures cannot be used directly in the ratio.
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Homologous temperature is a concept used in materials science, particularly in the study of the mechanical behavior of materials at elevated temperatures. It is defined as the ratio of the temperature of the material (in absolute terms, such as Kelvin) to its melting temperature (also in absolute terms).