( ( The ( pressure increase ) ) ( ( is ( related ( to ( ( the ( volume decrease ) ) ( of ( ( the gas ) ( in ( the syringe ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN pressure) (NN increase)) (VP (VBZ is) (ADJP (VBN related) (PP (TO to) (NP (NP (DT the) (NN volume) (NN decrease)) (PP (IN of) (NP (NP (DT the) (NN gas)) (PP (IN in) (NP (DT the) (NN syringe))))))))) (. .)))
The pressure increase is related to the volume decrease of the gas in the syringe.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NN gas) (NNS particles)) (VP (VB heat) (PRT (RP up))))) (, ,) (NP (NN pressure)) (VP (VBP increase)) (. .)))