( ( DIFFUSION Diffusion ) ( ( is ( ( the ( spontaneous tendency ) ) ( of ( a ( substance ( to ( ( move ( from ( ( higher concentrations ) ( of ( that substance ) ) ) ) ) ( to ( ( ( lower concentrations ) , ) ( ( the tendency ) ( of ( a ( substance ( to ( occupy ( ( the space ) ( it ( occupies fully ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP DIFFUSION) (NNP Diffusion)) (VP (VBZ is) (NP (NP (DT the) (JJ spontaneous) (NN tendency)) (PP (IN of) (NP (DT a) (NN substance) (S (VP (TO to) (VP (VB move) (PP (IN from) (NP (NP (JJR higher) (NNS concentrations)) (PP (IN of) (NP (DT that) (NN substance))))) (PP (TO to) (NP (NP (JJR lower) (NNS concentrations)) (, ,) (NP (NP (DT the) (NN tendency)) (PP (IN of) (NP (DT a) (NN substance) (S (VP (TO to) (VP (VB occupy) (NP (NP (DT the) (NN space)) (SBAR (S (NP (PRP it)) (VP (VBZ occupies) (ADVP (RB fully))))))))))))))))))))) (. .)))
DIFFUSION Diffusion is the spontaneous tendency of a substance to move from higher concentrations of that substance to lower concentrations, the tendency of a substance to occupy the space it occupies fully.
(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.