( Pressure ( ( is ( defined ( as ( ( the force ) ( acting ( on ( ( an object ) ( ( divided ( by ( the area ) ) ) ( upon ( which ( ( the force ) ( is acting ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Pressure)) (VP (VBZ is) (VP (VBN defined) (PP (IN as) (NP (NP (DT the) (NN force)) (VP (VBG acting) (PP (IN on) (NP (NP (DT an) (NN object)) (VP (VBN divided) (PP (IN by) (NP (DT the) (NN area))) (PP (IN upon) (SBAR (WHNP (WDT which)) (S (NP (DT the) (NN force)) (VP (VBZ is) (VP (VBG acting)))))))))))))) (. .)))
Pressure is defined as the force acting on an object divided by the area upon which the force is acting.
(ROOT (S (NP (NN Pressure)) (VP (VBZ is) (VP (VBN defined) (PP (IN in) (NP (NN physics))) (PP (IN as) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NP (NN force)) (VP (VBG pushing) (PP (IN against) (NP (DT a) (VBN given) (NN area)))))))))) (. .)))