Energy for Generation or Addition of Entropy

The fact that energy is needed to generate entropy does not mean that special efforts or equipment are necessary. Quite the contrary  

Just consider friction. On the contrary, special caution and devices are necessary to avoid this—such as ball bearings, lubricants, etc., in the case of cars. 

Clausius derived a relation for determining the change of entropy AS in a body— an iron block, for instance—while it heats from a temperature T up to T2. We can 

In this way, Clausius defined the quantity entropy for the first time a century and a half ago. 

To improve understanding, we will contrast an entropy conserving process with one that generates entropy in two simple experiments. In order for an undesired exchange of entropy with the surroundings not to falsify the results, the samples must be well insulated, or the experiments must be carried out very quickly. Let us begin with the entropy conserving process, the expansion of rubber (Experiment 3.9). 

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