( ( His hypothesis ) ( ( stated ( that ( ( ( equal volumes ) ( of gases ) ) ( , ( ( at ( the ( same ( ( temperature and ) pressure ) ) ) ) ( , ( contain ( ( an ( equal number ) ) ( of ( molecules ( -LRB- ( 1811 -RRB- ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP$ His) (NNS hypothesis)) (VP (VBD stated) (SBAR (IN that) (S (NP (NP (JJ equal) (NNS volumes)) (PP (IN of) (NP (NNS gases)))) (, ,) (PP (IN at) (NP (DT the) (JJ same) (NN temperature) (CC and) (NN pressure))) (, ,) (VP (VBP contain) (NP (NP (DT an) (JJ equal) (NN number)) (PP (IN of) (NP (NP (NNS molecules)) (PRN (-LRB- -LRB-) (NP (CD 1811)) (-RRB- -RRB-))))))))) (. .)))
His hypothesis stated that equal volumes of gases, at the same temperature and pressure, contain an equal number of molecules (1811).
(ROOT (S (S (VP (VBG Reducing) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS molecules)) (PP (IN in) (NP (DT a) (JJ rigid) (NN container)))))))) (VP (VBZ causes) (NP (NN pressure)) (S (VP (TO to) (VP (VB decrease))))) (. .)))