( ( If ( ( ( the temperature ) ( of ( a gas ) ) ) ( is increased ) ) ) ( , ( ( the volume ) ( increases . ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (NP (DT the) (NN temperature)) (PP (IN of) (NP (DT a) (NN gas)))) (VP (VBZ is) (VP (VBN increased))))) (, ,) (NP (DT the) (NN volume)) (VP (VBZ increases)) (. .)))
If the temperature of a gas is increased, the volume 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)))))) (. .)))