( ( ( ( ( ( In ( the ( most ( common system ) ) ) ) ( ( a vacuum ) ( is ( applied ( to ( reduce ( ( the ( boiling point ) ) ( of ( the water ) ) ) ) ) ) ) ) ) , ) or ) ( ( ( a ( spray ( or ( thin film ) ) ) ) ( of water ) ) ( is ( ( ( exposed ( to ( high heat ) ) ) , ) ( causing ( flash evaporation ) ) ) ) ) ) ; )
(ROOT (S (S (PP (IN In) (NP (DT the) (JJS most) (JJ common) (NN system))) (NP (DT a) (NN vacuum)) (VP (VBZ is) (VP (VBN applied) (S (VP (TO to) (VP (VB reduce) (NP (NP (DT the) (JJ boiling) (NN point)) (PP (IN of) (NP (DT the) (NN water)))))))))) (, ,) (CC or) (S (NP (NP (DT a) (NN spray) (CC or) (JJ thin) (NN film)) (PP (IN of) (NP (NN water)))) (VP (VBZ is) (VP (VBN exposed) (PP (TO to) (NP (JJ high) (NN heat))) (, ,) (S (VP (VBG causing) (NP (NN flash) (NN evaporation))))))) (: ;)))
In the most common system a vacuum is applied to reduce the boiling point of the water, or a spray or thin film of water is exposed to high heat, causing flash evaporation;
(ROOT (S (NP (NP (NNP Heat)) (PP (IN from) (NP (DT the) (NN sun)))) (VP (VBZ causes) (NP (NP (DT the) (JJS most) (NN evaporation)) (PP (IN of) (NP (NN water)))) (PP (IN from) (NP (DT a) (NN lake)))) (. .)))
Heat from the sun causes the most evaporation of water from a lake.