( Evaporation ( ( is ( when ( ( liquid water ) ( turns ( to ( gaseous ( water ( or ( water vapor ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Evaporation)) (VP (VBZ is) (SBAR (WHADVP (WRB when)) (S (NP (JJ liquid) (NN water)) (VP (VBZ turns) (S (VP (TO to) (VP (VB gaseous) (NP (NN water) (CC or) (NN water) (NN vapor))))))))) (. .)))
Evaporation is when liquid water turns to gaseous water or water 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.