Rocket engine needs enormous amount of thrust to escape Earth’s gravitational pull. However the chemicals used for engines are Hydrogen and Oxygen (Hydrogen used as a fuel, while Oxygen as a oxidiser) that produces a good thrust, found in Earth in the form of gas. Carrying hydrogen and oxygen in their gaseous form will require a bigger fuel chamber, which not only increase the size but also weight of the rockets and this will mean undertaking of impossible task to send a launch vehicle into space. So the solution is to use hydrogen and oxygen in their liquid form or in a cryogenic form which is easier to transport, as the volume of propellent decrease. As density increases in liquid form, more thrust can be produce in less burning time. Such engines are called Vryogenic engine.
A Cryogenic rocket stage is more efficient and provides more thrust for every kilogram of propellant it burns compared
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