( It ( ( ( is ( useful ( for ( this application ) ) ) ) ( because ( it ( ( remains ( a gas ) ) ( even ( at ( ( the ( low temperature ) ) ( of ( liquid hydrogen ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (ADJP (JJ useful) (PP (IN for) (NP (DT this) (NN application)))) (SBAR (IN because) (S (NP (PRP it)) (VP (VBZ remains) (NP (DT a) (NN gas)) (PP (RB even) (IN at) (NP (NP (DT the) (JJ low) (NN temperature)) (PP (IN of) (NP (JJ liquid) (NN hydrogen))))))))) (. .)))
It is useful for this application because it remains a gas even at the low temperature of liquid hydrogen.
(ROOT (S (NP (NNS Gases) (CC and) (NNS liquids)) (VP (VBP become) (NP (NNS solids)) (PP (IN at) (NP (JJ low) (NNS temperatures)))) (. .)))
Gases and liquids become solids at low temperatures.