费恩曼物理学讲义中的问题.我用中文说可能翻译的不太确切,直接上原文了.Nowletusputtwiceasmanymoleculesinthistank,soastodoublethedensity,andletthemhavethesamespeed,i.e.,thesametemperature.Then,toacl

　　费恩曼物理学讲义中的问题.

　　我用中文说可能翻译的不太确切,直接上原文了.Nowletusputtwiceasmanymoleculesinthistank,soastodoublethedensity,andletthemhavethesamespeed,i.e.,thesametemperature.Then,toacloseapproximation,thenumberofcollisionswillbedoubled,andsinceeachwillbejustas"energetic"asbefore,thepressureisproportionaltothedensity.Ifweconsiderthetruenatureoftheforcesbetweentheatoms,wewouldexoectaslightdecreaseinpressurebecauseoftheattractionbetweentheatoms,andaslightincreasebecauseofthefinitevolume,theyoccupy.如何解释文中的因为原子之间的吸引力而导致压强轻微减小?