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(ROOT (S (PP (NP (NNP F) (NNP Solid-State) (NNP Physics)) (IN In) (NP (NNS solids))) (, ,) (NP (DT the) (NNS atoms)) (VP (VBP are) (ADJP (RB closely) (VBN packed)) (, ,) (S (VP (VBG leading) (PP (TO to) (NP (NP (JJ strong) (JJ interactive) (NNS forces)) (CC and) (NP (NP (JJ numerous) (JJ interrelated) (NNS effects)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (RB not) (ADJP (JJ observed) (PP (IN in) (NP (NP (NNS gases)) (, ,) (SBAR (WHADVP (WRB where)) (S (NP (DT the) (NNS molecules)) (ADVP (RB largely)) (VP (VB act) (ADVP (RB independently))))))))))))))))) (. .)))
F Solid-State Physics In solids, the atoms are closely packed, leading to strong interactive forces and numerous interrelated effects that are not observed in gases, where the molecules largely act independently.
(ROOT (S (NP (NNP Solid)) (VP (VBZ is) (VP (VBN characterized) (PP (IN by) (NP (NP (NP (NNS molecules)) (PP (IN with) (NP (JJ minimal) (NN movement)))) (CC and) (NP (NP (JJ strong) (NNS forces)) (PP (IN between) (NP (PRP them)))))))) (. .)))