( ( If ( ( ( the volume ) ( -LRB- ( ( ( the space ) ( occupied ( by ( the gas ) ) ) ) -RRB- ) ) ) ( is decreased ) ) ) ( , ( ( ( the number ) ( of ( blows ( against ( the wall ) ) ) ) ) ( ( ( ( is increased ) , ) ( thereby ( ( increasing ( the pressure ) ) ( if ( ( the temperature ) ( remains constant ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (NP (DT the) (NN volume)) (PRN (-LRB- -LRB-) (NP (NP (DT the) (NN space)) (ADJP (VBN occupied) (PP (IN by) (NP (DT the) (NN gas))))) (-RRB- -RRB-))) (VP (VBZ is) (VP (VBN decreased))))) (, ,) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS blows)) (PP (IN against) (NP (DT the) (NN wall)))))) (VP (VBZ is) (ADJP (JJ increased)) (, ,) (S (ADVP (RB thereby)) (VP (VBG increasing) (NP (DT the) (NN pressure)) (SBAR (IN if) (S (NP (DT the) (NN temperature)) (VP (VBZ remains) (ADJP (JJ constant)))))))) (. .)))
If the volume (the space occupied by the gas) is decreased, the number of blows against the wall is increased, thereby increasing the pressure if the temperature remains constant.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (PRP you)) (VP (VBP add) (NP (NP (NNS moles)) (PP (IN of) (NP (NP (NN gas)) (PP (TO to) (NP (DT a) (NN baloon)))))) (PP (IN by) (S (VP (VBG blowing) (NP (PRP it)) (PRT (RP up)))))))) (, ,) (NP (DT the) (NN volume)) (VP (VBZ increases)) (. .)))