( ( ( When ( ( ( the volume ) ( of ( ( a ( given mass ) ) ( of gas ) ) ) ) increases ) ) ( , ( ( its pressure ) decreases ) ) ) ( , ( ( ( provided ( that ( ( the temperature ) remains ) ) ) ( constant ( -LRB- ( ( ( Boyle 's ) Law ) -RRB- ) ) ) ) . ) ) )
(ROOT (SINV (S (SBAR (WHADVP (WRB When)) (S (NP (NP (DT the) (NN volume)) (PP (IN of) (NP (NP (DT a) (VBN given) (NN mass)) (PP (IN of) (NP (NN gas)))))) (VP (VBZ increases)))) (, ,) (NP (PRP$ its) (NN pressure)) (VP (VBZ decreases))) (, ,) (VP (VBD provided) (SBAR (IN that) (S (NP (DT the) (NN temperature)) (VP (VBZ remains))))) (NP (NP (JJ constant)) (PRN (-LRB- -LRB-) (NP (NP (NNP Boyle) (POS 's)) (NN Law)) (-RRB- -RRB-))) (. .)))
When the volume of a given mass of gas increases, its pressure decreases, provided that the temperature remains constant (Boyle's Law).
(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)))))) (. .)))