A liquid-fuel rocket or a liquid rocket is a rocket with an
engine that uses propellants in liquid form.
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There are solid rocket fuels, and there are liquid rocket
fuels.
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liquid fuel
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It was a liquid fuel rocket.
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The name of a common rocket fuel is liquid hydrogen, which is often used in combination with liquid oxygen. There are also other types of rocket fuels including solid fuels and hybrid fuels, but liquid hydrogen is one of the most commonly used.