( ( ( Evaporation ( ( -LRB- ( ( Evaporation ( of Water ) ) -RRB- ) ) Emission ) ) ( of water ) ) ( ( ( vapor ( by ( ( the ( free surface ) ) ( of ( liquid water ) ) ) ) ) ( at ( ( a temperature ) ( below ( the ( boiling point ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Evaporation) (PRN (-LRB- -LRB-) (NP (NP (NNP Evaporation)) (PP (IN of) (NP (NNP Water)))) (-RRB- -RRB-)) (NNP Emission)) (PP (IN of) (NP (NN water)))) (VP (VBP vapor) (PP (IN by) (NP (NP (DT the) (JJ free) (NN surface)) (PP (IN of) (NP (JJ liquid) (NN water))))) (PP (IN at) (NP (NP (DT a) (NN temperature)) (PP (IN below) (NP (DT the) (JJ boiling) (NN point)))))) (. .)))
Evaporation (Evaporation of Water) Emission of water vapor by the free surface of liquid water at a temperature below the boiling point.
(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.