( Cavitation ( ( is ( ( the formation ) ( of ( ( vapor bubbles ) ( in ( water ( near ( ( a ( moving ( propeller blade ) ) ) ( in ( regions ( of ( ( low pressure ) ( due ( to ( ( Bernoulli 's ) principle ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Cavitation)) (VP (VBZ is) (NP (NP (DT the) (NN formation)) (PP (IN of) (NP (NP (NN vapor) (NNS bubbles)) (PP (IN in) (NP (NP (NN water)) (PP (IN near) (NP (NP (DT a) (VBG moving) (NN propeller) (NN blade)) (PP (IN in) (NP (NP (NNS regions)) (PP (IN of) (NP (NP (JJ low) (NN pressure)) (ADJP (JJ due) (PP (TO to) (NP (NP (NNP Bernoulli) (POS 's)) (NN principle)))))))))))))))) (. .)))
Cavitation is the formation of vapor bubbles in water near a moving propeller blade in regions of low pressure due to Bernoulli's principle.
(ROOT (S (NP (PRP You)) (VP (VBP call) (NP (NP (DT the) (NN formation)) (PP (IN of) (NP (DT a) (NN water) (NN vapor) (NN pocket) (NN cavitation))))) (. .)))