Question

why liquid hydrogen is used as fuel in Rockets . why not only hydrogen ?​

Answer 1

The primary performance advantage of liquid propellants is due to the oxidizer. Several practical liquid oxidizers (liquid oxygen, nitrogen tetroxide, and hydrogen peroxide) are available which have better specific impulse than the ammonium perchlorate used in most solid rockets, when paired with comparable fuels.

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Answer 2

LIQUID HYDROGEN is highly flammable that helps to get more power for the rocket and rocket gets quickly gets in air because of the pressure created by liquid hydrogen hence liquid hydrogen is used as fuel in ROCKETS
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