Question

Why do rockets carry liquid oxygen not in the gaseous form?

Answer 1

Answers

Oxygen as fuel to react with hydrogen can be stored more efficiently in liquid form as it is far more dense than in a gaseous form. In addition to this the oxygen will react with the hydrogen fuel and upon releasing energy as thrust will also generate some water (Two hydrogen, one oxygen) in which the astronauts can (obviously) drink later.

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Answer 2

As O2 is stored at high pressure in the containers, so more o2 can be stored in form of liquid than in form of gas. As the o2 comes out of container it mixes with other fuels in form of gas.