( ( ( ( ( ( ( The volume ) ( of ( a gas ) ) ) ( will ( vary ( by ( its pressure ) ) ) ) ) , ) and ) ( ( ( ( liquid and ) solid ) volumes ) ( normally ( ( ( increase ( ( -LRB- ( somewhat -RRB- ) ) ( with ( increased temperature ) ) ) ) , ) ( reflecting ( a ( decreased density ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NP (DT The) (NN volume)) (PP (IN of) (NP (DT a) (NN gas)))) (VP (MD will) (VP (VB vary) (PP (IN by) (NP (PRP$ its) (NN pressure)))))) (, ,) (CC and) (S (NP (ADJP (JJ liquid) (CC and) (JJ solid)) (NNS volumes)) (ADVP (RB normally)) (VP (VBP increase) (PP (PRN (-LRB- -LRB-) (ADVP (RB somewhat)) (-RRB- -RRB-)) (IN with) (NP (VBN increased) (NN temperature))) (, ,) (S (VP (VBG reflecting) (NP (DT a) (VBN decreased) (NN density)))))) (. .)))
The volume of a gas will vary by its pressure, and liquid and solid volumes normally increase (somewhat) with increased temperature, reflecting a decreased density.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NP (NN temperature) (NNS increases)) (PP (CC but) (NP (NP (NN amount)) (PP (IN of) (NP (NP (NN gas)) (CC and) (NP (PRP$ its) (NN pressure))))))) (VP (VBP are) (ADJP (JJ constantvolume))))) (NP (NNS increases)) (VP (VBZ happens) (PP (TO to) (NP (NP (DT the) (NN volume)) (PP (IN of) (NP (DT the) (NN gas)))))) (. .)))