( Diffusion ( ( is ( ( the ( passive movement ) ) ( of ( ( gas molecules ) ( from ( regions ( of ( ( ( high concentration ) ( -LRB- ( ( partial pressure ) -RRB- ) ) ) ( to ( regions ( of ( ( low concentration ) ( -LRB- ( ( partial pressure ) -RRB- ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Diffusion)) (VP (VBZ is) (NP (NP (DT the) (JJ passive) (NN movement)) (PP (IN of) (NP (NP (NN gas) (NNS molecules)) (PP (IN from) (NP (NP (NNS regions)) (PP (IN of) (NP (NP (NP (JJ high) (NN concentration)) (PRN (-LRB- -LRB-) (NP (JJ partial) (NN pressure)) (-RRB- -RRB-))) (PP (TO to) (NP (NP (NNS regions)) (PP (IN of) (NP (NP (JJ low) (NN concentration)) (PRN (-LRB- -LRB-) (NP (JJ partial) (NN pressure)) (-RRB- -RRB-)))))))))))))) (. .)))
Diffusion is the passive movement of gas molecules from regions of high concentration (partial pressure) to regions of low concentration (partial pressure).
(ROOT (S (NP (NNP Diffusion)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (DT the) (NN movement)) (PP (IN of) (NP (NP (NNS molecules)) (PP (IN from) (NP (NP (DT an) (NN area)) (PP (IN of) (NP (NP (JJ high) (NN concentration)) (PP (TO to) (NP (NP (DT an) (NN area)) (PP (IN of) (NP (JJ low) (NN concentration))))))))))))))) (. .)))