( Gas ( ( is ( ( defined ( as ( a ( formless fluid ) ) ) ) ( ( ( ( that ( ( expands readily ) ( to ( fill ( any ( containing vessel ) ) ) ) ) ) , ) and ) ( which ( can ( be ( ( changed ( to ( the ( ( ( liquid or ) solid ) state ) ) ) ) ( only ( by ( ( the ( combined effect ) ) ( of ( increased ( pressure ( and ( decreased temperature ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Gas)) (VP (VBZ is) (VP (VBN defined) (PP (IN as) (NP (DT a) (JJ formless) (NN fluid))) (SBAR (SBAR (WHNP (WDT that)) (S (VP (VBZ expands) (ADVP (RB readily)) (S (VP (TO to) (VP (VB fill) (NP (DT any) (JJ containing) (NN vessel)))))))) (, ,) (CC and) (SBAR (WHNP (WDT which)) (S (VP (MD can) (VP (VB be) (VP (VBN changed) (PP (TO to) (NP (DT the) (ADJP (JJ liquid) (CC or) (JJ solid)) (NN state))) (PP (RB only) (IN by) (NP (NP (DT the) (VBN combined) (NN effect)) (PP (IN of) (NP (VBN increased) (NN pressure) (CC and) (VBN decreased) (NN temperature))))))))))))) (. .)))
Gas is defined as a formless fluid that expands readily to fill any containing vessel, and which can be changed to the liquid or solid state only by the combined effect of increased pressure and decreased temperature.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NP (DT the) (NN solubility)) (PP (IN of) (NP (NP (NNS gases)) (PP (IN in) (NP (NNS liquids)))))) (VP (VBZ changes) (PP (IN with) (NP (VBG increasing) (NN temperature)))))) (, ,) (NP (PRP it)) (VP (VBZ decreases)) (. .)))