Qualitatively, entropy is simple. What it is, why it is so useful in understanding the behavior of macro systems or of molecualr systems is easy to state. The key to simplicity has been mentioned by chemists and physicists. In classical thermodynamics, it is viewing entropy increase as a measure of the dispersal of energy from localized to spread out (as in the examples of the next section). In "molecular thermodynamics" it is considering the change in systems from having fewer accessible microstates to having many more accessible microstates (as described in later sections). Most important to educators, emphasizing energy dispersal can provide a direct relationship of molecular behavior to entropy change, an idea that can be readily understood by beginning college students.
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