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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