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Hydrogen is often preferred to hydrocarbon fuel for scramjets because

  • A.It reacts fast and absorbs much heat
  • B.It is cheaper to produce
  • C.It is denser and easier to store
  • D.It burns at a lower temperature

Answer: A

Rapid reaction chemistry suits the millisecond residence time, and the fuel can absorb a great deal of heat before combustion. Its low density and cryogenic storage are severe practical drawbacks, which is why hydrocarbon scramjets remain of interest.

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