( Properties ( of ( ( ( ( ( ( pressure , ) ( specific volume ) ) , ) and ) temperature ) ( -LRB- ( ( ( 3 classes ) . ) -RRB- ) ) ) ) )
(ROOT (NP (NP (NNP Properties)) (PP (IN of) (NP (NP (NN pressure)) (, ,) (NP (JJ specific) (NN volume)) (, ,) (CC and) (NP (NN temperature)) (PRN (-LRB- -LRB-) (NP (NP (CD 3)) (NP (NNS classes))) (. .) (-RRB- -RRB-))))))
Properties of pressure, specific volume, and temperature (3 classes.)
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NN volume)) (VP (VBZ does) (RB not) (VP (VB change))))) (, ,) (NP (NN temperature)) (VP (VBZ is) (ADJP (JJ proportional) (S (VP (TO to) (VP (VB pressure)))))) (. .)))