( ( As ( ( the volume ) ( of ( a ( confined ( gas increases ) ) ) ) ) ) ( ( the pressure ) ( decreases . ) ) )
(ROOT (S (PP (IN As) (NP (NP (DT the) (NN volume)) (PP (IN of) (NP (DT a) (JJ confined) (NN gas) (NNS increases))))) (NP (DT the) (NN pressure)) (VP (VBZ decreases)) (. .)))
As the volume of a confined gas increases the pressure decreases.
(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)))))) (. .)))