( ( If ( ( ( a sample ) ( of gas ) ) ( is ( kept ( at ( constant pressure ) ) ) ) ) ) ( , ( ( ( volume increases ) ( as ( the temperature ) ) ) ( increases . ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (NP (DT a) (NN sample)) (PP (IN of) (NP (NN gas)))) (VP (VBZ is) (VP (VBN kept) (PP (IN at) (NP (JJ constant) (NN pressure))))))) (, ,) (NP (NP (NN volume) (NNS increases)) (PP (IN as) (NP (DT the) (NN temperature)))) (VP (VBZ increases)) (. .)))
If a sample of gas is kept at constant pressure, volume increases as the temperature increases.
(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)))))) (. .)))