( ( ( ( Start ( with ( liquid water ) ) ) ( at ( its ( boiling point ) ) ) ) ( at pressure ) ) P. )
(ROOT (SINV (VP (VBD Start) (PP (IN with) (NP (JJ liquid) (NN water))) (PP (IN at) (NP (PRP$ its) (JJ boiling) (NN point))) (PP (IN at) (NP (NN pressure)))) (NP (NNP P.))))
Start with liquid water at its boiling point at pressure P.
(ROOT (S (NP (NNP External) (NN pressure)) (VP (VBZ affects) (NP (NP (DT the) (JJ boiling) (NN point)) (PP (IN of) (NP (NN water))))) (. .)))