본문 D15.2 See Figures 15.8 and 15.10, the Brief Illustration in Section 15.3(a), and Self-test 15.6 for details. If the levels are non-degenerate, then both quantities increase from zero to a limiting value in a roughly sigmoidal shape. At very low temperatures, only the lower energy level is accessible, resulting in a highly ordered system at the energy of the lower level. At very high temperatures, the states are occupied practically equally, giving a highly disordered system whose mean energy is halfway between the two levels.
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