( ( For ( ( a fluid ) ( at rest ) ) ) ( , ( ( ( the difference ) ( in ( pressure ( between ( ( two points ) ( in it ) ) ) ) ) ) ( ( depends ( upon ( ( ( ( only ( the Density ) ) ( of ( the fluid ) ) ) and ) ( ( ( the difference ) ( in ( ( depth or ) altitude ) ) ) ( between ( the ( two points ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN For) (NP (NP (DT a) (NN fluid)) (PP (IN at) (NP (NN rest))))) (, ,) (NP (NP (DT the) (NN difference)) (PP (IN in) (NP (NP (NN pressure)) (PP (IN between) (NP (NP (CD two) (NNS points)) (PP (IN in) (NP (PRP it)))))))) (VP (VBZ depends) (PP (IN upon) (NP (NP (NP (RB only) (DT the) (NNP Density)) (PP (IN of) (NP (DT the) (NN fluid)))) (CC and) (NP (NP (DT the) (NN difference)) (PP (IN in) (NP (NN depth) (CC or) (NN altitude))) (PP (IN between) (NP (DT the) (CD two) (NNS points))))))) (. .)))
For a fluid at rest, the difference in pressure between two points in it depends upon only the Density of the fluid and the difference in depth or altitude between the two points.
(ROOT (S (NP (NNP Depth) (CC and) (NNP density)) (VP (VBP are) (NP (NP (DT the) (CD two) (NNS factors)) (SBAR (WHNP (WDT that)) (S (VP (VBP affect) (NP (NP (DT the) (NN pressure)) (PP (IN of) (NP (NNS fluids))))))))) (. .)))