Imagine if modifications

Imagine If Modifications—Let Us Not Overexaggerate the Dangers as We Perform Safety Studies... 

Imagine If" modifications - let us not exaggerate the dangers as we perform safety studies... 

We then consider all the modifications by which the system A may be imagined to change from the given state, and we calculate the change in value that they would give to the entropy S of the total system C, If none of these modifications causes the entropy S to increase, none of them can be realized and the system A remains forcibly in equilibrium in the state considered. 

The real isothermal change considered is composed of a series of states of the system imagine that by means of external actions suitably chosen, whose nature it is not necessary to specify, we may keep the system in equilibrium in each of these states. The series of these states of equifibrium would form a reversible isothermal modification bringing the system from the same initial state 0 to the same final state 1 as the real modification considered for this reverEdble modification the non-compensated transformation P would have the value 0 if, therefore, we denote by W/ the work done by the external forces which act upon the system during this reversible modification, equation (28) would give, for this change,... 

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