( Charles ( ( showed ( that ( ( raising ( ( the temperature ) ( of ( a gas ) ) ) ) ( would ( tend ( to ( ( ( increase ( ( the volume ) ( of ( the gas ) ) ) ) , ) ( if ( ( its pressure ) ( remained constant ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Charles)) (VP (VBD showed) (SBAR (IN that) (S (S (VP (VBG raising) (NP (NP (DT the) (NN temperature)) (PP (IN of) (NP (DT a) (NN gas)))))) (VP (MD would) (VP (VB tend) (S (VP (TO to) (VP (VB increase) (NP (NP (DT the) (NN volume)) (PP (IN of) (NP (DT the) (NN gas)))) (, ,) (SBAR (IN if) (S (NP (PRP$ its) (NN pressure)) (VP (VBD remained) (ADJP (JJ constant))))))))))))) (. .)))
Charles showed that raising the temperature of a gas would tend to increase the volume of the gas, if its pressure remained constant.
(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)))))) (. .)))