( ( ( Evaporation ( ( The conversion ) ( of ( liquid water ) ) ) ) ( to ( water vapor ) ) ) . )
(ROOT (S (VP (VB Evaporation) (NP (NP (DT The) (NN conversion)) (PP (IN of) (NP (JJ liquid) (NN water)))) (PP (TO to) (NP (NN water) (NN vapor)))) (. .)))
Evaporation The conversion of liquid water to 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.