( ( ( Evaporation - ) ( When ( ( ( water changes ) ( into water ) ) ( vapor ( as ( it ( is heated ) ) ) ) ) ) ) . )
(ROOT (X (NP (NNP Evaporation)) (: -) (FRAG (SBAR (WHADVP (WRB When)) (S (NP (NP (NN water) (NNS changes)) (PP (IN into) (NP (NN water)))) (VP (VBP vapor) (SBAR (IN as) (S (NP (PRP it)) (VP (VBZ is) (ADJP (JJ heated))))))))) (. .)))
Evaporation- When water changes into water vapor as it is heated.
(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.