# Gases

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## Box or rectangle potential

Box or rectangle potential
The box or rectangular potential now also takes attractive interactions between the particles into account. In the hard-ball model, the repulsion occurs abruptly at a distance r = σ. In the model of point repulsion, the repulsive interaction increases steadily with decreasing particle distance.

Fig.1

$E.p$ = ∞ for distances r ≤ σ$E.p$ = -ε for distances σ E.p = 0 for distances r> σ

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