20. ________ is used for burning fuel in rockets and space ships.

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Solution

Oxygen $(O_{2})$ is essential for the burning of fuels.
Oxygen is used in rocket propellant to act as the oxidizer.
Oxygen helps to burn fuel in order to help launch the spacecraft.
In order to have a smaller tank on the rocket, oxygen is used in compressed liquid form.
Hence, liquid Oxygen is used for burning fuel in rockets and space ships.

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