( Therefore ( , ( ( the smaller ) ( ( the ( gas bubbles ) ) ( ( created ( ( the smaller ) ( ( the ( oil droplet ) ) ( floated ( to ( the surface ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (ADVP (RB Therefore)) (, ,) (X (DT the) (ADJP (JJR smaller))) (NP (DT the) (NN gas) (NNS bubbles)) (VP (VBD created) (NP (NP (DT the) (JJR smaller)) (SBAR (S (NP (DT the) (NN oil) (NN droplet)) (VP (VBD floated) (PP (TO to) (NP (DT the) (NN surface)))))))) (. .)))
Therefore, the smaller the gas bubbles created the smaller the oil droplet floated to the surface.
(ROOT (S (NP (NNP Gas) (NN bubble) (NNS holes)) (VP (VBZ helps) (NP (NP (JJ pumice) (NN float)) (PP (IN in) (NP (NN water))))) (. .)))