Absolute thermodynamic temperature can be defined so that a reversible engine exchanging heats and with reservoirs at and satisfiesA choice of one reference temperature fixes the scale.
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Thermodynamic temperature is a measure of temperature defined in terms of the absolute temperature scale, which is independent of the properties of any particular substance. It is based on the concept of absolute zero, the theoretical point at which a system's entropy reaches its minimum value, and all thermal motion of its particles ceases. In the International System of Units (SI), thermodynamic temperature is measured in kelvins (K).