( Diffusion ( ( is ( when ( particles ( ( move ( from ( a ( high ( concentrated area ) ) ) ) ) ( to ( a ( ( low concentrated ) area ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Diffusion)) (VP (VBZ is) (SBAR (WHADVP (WRB when)) (S (NP (NNS particles)) (VP (VBP move) (PP (IN from) (NP (DT a) (JJ high) (JJ concentrated) (NN area))) (PP (TO to) (NP (DT a) (ADJP (RB low) (VBN concentrated)) (NN area))))))) (. .)))
Diffusion is when particles move from a high concentrated area to a low concentrated area.
(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))))))))))))))) (. .)))