Kelvin's Thermodynamic Scale of Temperature

Lord Kelvin proposed a new temperature scale based on the efficiency of Carnot's reversible engine, independent of the working substance. This scale, known as the absolute scale of temperature, aligns with the ideal gas scale. The theory behind this absolute scale relates the efficiency of a reversible engine to the heat absorbed and rejected at different temperatures.

• Lord Kelvin
• Temperature Scale
• Carnot Engine
• Thermodynamics
• Reversible Engine

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Uploaded on Feb 17, 2025 | 0 Views

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1. Kelvin's Thermodynamic Scale of Temperature

2. The efficiency of reversible Carnot's engine depends only upon the two temperatures between which it works and is independent of the properties (nature) of working substance. Using this property of Camot's reversible engine which solely or absolutely depends on temperature and nothing de Lord Kelvin in 1848 suggested a new scale of temperature, known as 'absolute scale of temperature.

3. Lord Kelvin worked out the theory of such an absolute scale, called the Kelvin's work or thermodynamic scale and showed that it agrees with the ideal gas scale.

4. Theory: Suppose a reversible engine absorbs heat Q1 at temperature 1 and rejects the heat Q2 at temperature (measured on any arbitrary scale) then since the efficiency of the engine is a function of these two