Example 4.2. Evaluation of the Carnot Factor

Use data from the Steam Tables, say in the interval 2 C to S0 C, to obtain numerical values for C  

All pertinent information and C values are presented in the top of the next page  

If we compare Clapeyron s efficiency of the Carnot cycle, Eq.4.8.1, with the one we developed in Chapter 3, Eq.3.5.3, it follows that C = J, i.e. the absolute temperature. (This, of course, was not doneimtil later.) And this is why the calculated values of C are, within the accuracy of evaluating the slope (dP /dt)y equal to the absolute temperature in Kelvin. 

Carnot s somewhat abstract ideas about the heat engine and Clapeyron s quantitative interpretation of them laid the foundations for the establishment of the second law. This, however, was not done until the 1850 s and 1860 s by Kelvin and Clausius. In the between, the foundations for the first law were laid by Joule. 

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