( 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 process)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (DT a) (NN substance)) (ADVP (RB naturally)) (VP (VBZ moves) (PP (IN from) (NP (NP (DT an) (NN area)) (PP (IN of) (NP (NP (JJR higher)) (PP (TO to) (NP (JJR lower) (NN concentration)))))))))))) (. .)))
Diffusion is the process in which a substance naturally moves from an area of higher to lower concentration.