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A sub­stance that causes an ob­ject to move for­ward or change di­rec­tion.

Solid fuel

Solid ma­te­rial used as pro­pel­lant, such as the gun­pow­der in older rock­ets. Mod­ern space­craft use a va­ri­ety of so­phis­ti­cated chem­i­cals in pow­der form.

Liq­uid fuel

Fuel that is not solid. Our cars use liq­uid fuel in the form of petrol and large rock­ets of­ten use liq­uid hy­dro­gen burned with liq­uid oxy­gen.

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