Question about T07.2(b)

When applying the thermodynamic limit, one should remember that "Delta-r" is a microscopic length scale, while the size "R" of the container is macroscopic. That is to say, when we take N to infinity, V goes to infinity and therefore the size of the container also (no matter if it is sphere of a rectangular box. So "Delta-r" can be neglected as compared to "R". In other words, "Delta-r/R" goes to zero in the thermodynamic limit.

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