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