( ( This ( evaporation process ) ) ( ( ( changes ( liquid water ) ) ( into ( a ( ( gas or ) vapor ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN evaporation) (NN process)) (VP (VBZ changes) (NP (JJ liquid) (NN water)) (PP (IN into) (NP (DT a) (NN gas) (CC or) (NN vapor)))) (. .)))
This evaporation process changes liquid water into a gas or vapor.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (JJ liquid) (NN water) (NNS changes)) (VP (TO to) (VP (VB water) (NP (NN vapor)))))) (NP (PRP it)) (VP (VBZ is) (VP (VBN called) (NP (NN evaporation)))) (. .)))
When liquid water changes to water vapor it is called evaporation.