( ( ( Adsorption : ) ( ( ( The adherence ) ( of ( atoms ( , ( ( ions or ) molecules ) ) ) ) ) ( of ( ( a ( ( gas or ) liquid ) ) ( to ( ( the surface ) ( of ( another substance ) ) ) ) ) ) ) ) . )
(ROOT (NP (NP (NNP Adsorption)) (: :) (NP (NP (DT The) (NN adherence)) (PP (IN of) (NP (NNS atoms) (, ,) (NNS ions) (CC or) (NNS molecules))) (PP (IN of) (NP (NP (DT a) (NN gas) (CC or) (NN liquid)) (PP (TO to) (NP (NP (DT the) (NN surface)) (PP (IN of) (NP (DT another) (NN substance)))))))) (. .)))
Adsorption : The adherence of atoms, ions or molecules of a gas or liquid to the surface of another substance.
(ROOT (S (PP (IN Within) (NP (DT a) (NN substance))) (, ,) (NP (NP (NNS atoms)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBP collide) (ADVP (RB frequently))) (CC and) (VP (VBP move) (ADVP (RB independently)) (PP (IN of) (NP (CD one) (DT another)))))))) (VP (VBP are) (ADJP (ADJP (RBS most) (JJ likely)) (PP (IN in) (NP (DT a) (NN gas)))))))