They don't care that there are other atoms and molecules around. So that's basically what you do when you take p goes to zero.

这正是当压强无限小时,气体的行为,气体的体积无限大。

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And finally up here we have n equals infinity.

最终我们让n等于无限大。

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When n equals infinity, r equals infinity.

当n为无限大时，r也为无限大。

麻省理工公开课 - 固态化学导论课程节选

The ionization energy must then be nothing more than, that is the energy to go from the ground state here to n equals infinity, so that would be the energy at state infinity minus the energy of the ground state.

这个电离能一定不会大于，从基态到n为无限大时的能量,而是等于,无限远处的能量减去基态能量。

麻省理工公开课 - 固态化学导论课程节选