( ( This law ) ( ( describes ( how ( ( , ( ( under ( ( the ( same condition ) ) ( of ( ( temperature and ) pressure ) ) ) ) , ) ) ( ( ( equal volumes ) ( of ( all gases ) ) ) ( contain ( ( the ( same number ) ) ( of molecules ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN law)) (VP (VBZ describes) (SBAR (WHADVP (WRB how)) (S (PRN (, ,) (PP (IN under) (NP (NP (DT the) (JJ same) (NN condition)) (PP (IN of) (NP (NN temperature) (CC and) (NN pressure))))) (, ,)) (NP (NP (JJ equal) (NNS volumes)) (PP (IN of) (NP (DT all) (NNS gases)))) (VP (VBP contain) (NP (NP (DT the) (JJ same) (NN number)) (PP (IN of) (NP (NNS molecules)))))))) (. .)))
This law describes how, under the same condition of temperature and pressure, equal volumes of all gases contain the same number of molecules.
(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))))) (. .)))