( ( ( ( ( ( ( The ( lower ( lifting efficiency ) ) ) ( of ( helium gas ) ) ) ( meant ( that ( ( a ( larger balloon ) ) ( would ( be needed ) ) ) ) ) ) , ) so ) ( Goodyear-Zeppelin ( ( increased ( the volume ) ) ( to ( 3,700,000 flip ) ) ) ) ) . )
(ROOT (S (S (NP (NP (DT The) (JJR lower) (NN lifting) (NN efficiency)) (PP (IN of) (NP (NNP helium) (NN gas)))) (VP (VBD meant) (SBAR (IN that) (S (NP (DT a) (JJR larger) (NN balloon)) (VP (MD would) (VP (VB be) (VP (VBN needed)))))))) (, ,) (IN so) (S (NP (NNP Goodyear-Zeppelin)) (VP (VBD increased) (NP (DT the) (NN volume)) (PP (TO to) (NP (QP (CD 3,700,000) (CD flip)))))) (. .)))
The lower lifting efficiency of helium gas meant that a larger balloon would be needed, so Goodyear-Zeppelin increased the volume to 3,700,000 flip .
(ROOT (S (PP (IN From) (NP (NP (NNS observations)) (ADJP (RB as) (JJ simple) (PP (IN as) (S (VP (VBG blowing) (PRT (RP up)) (NP (DT a) (NN balloon)))))))) (, ,) (NP (PRP it)) (VP (VBZ is) (ADJP (JJ clear)) (SBAR (IN that) (S (S (VP (VBG increasing) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NN gas)))))) (VP (VBZ increases) (NP (DT the) (NN volume)))))) (. .)))