We also know that unrestrained expansion or explosion

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Unformatted text preview: tude. We also know that unrestrained expansion (or explosion) and uncontrolled electron exchange (chemical reactions) generate entropy and are highly irreversible. Likewise, unrestrained opening of the mouth to scatter angry words is highly irreversible since this generates entropy, and it can cause considerable damage. A person who gets up in anger is bound to sit down at a loss. 7–7 I THE T ds RELATIONS Recall that the quantity (dQ/T)int rev corresponds to a differential change in a property, called entropy. The entropy change for a process, then, was FIGURE 7–27 As in mechanical systems, friction in the workplace is bound to generate entropy and reduce performance. cen54261_ch07.qxd 11/18/03 9:57 AM Page 292 292 FUNDAMENTALS OF THERMAL-FLUID SCIENCES evaluated by integrating dQ/T along some imaginary internally reversible path between the actual end states. For isothermal internally reversible processes, this integration is straightforward. But when the temperature varies during the process, we have to have a relation between dQ and T to perform this integration....
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