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How does the rocket fly in the vacuum?
Yes, a rocket can fly in the vacuum (space). It works on Newton's third law of motion, which states that on every action there is an equal and opposite reaction.
When a rocket shoots out hot gases from the nozzle, it creates thrust to propel the rocket forward in vacuum. This thrust depends on the speed of the exhaust gases and the mass of the gas being expelled every second which is sometimes called the burn rate in pounds of fuel per second.
A rocket engine is different from a jet engine. A jet engine needs air to work, whereas a rocket engine doesn't need air, because it carries everything with it that it needs, such as a fuel tank, an oxidizer tank, and something to spark an explosive reaction in the combustion chamber.
For liquid fuel-powered engines, fuel and oxidizer (liquid oxygen) mix and ignite in a combustion chamber causing a controlled explosion that is directed out through the engine bell.
For solid fuel-powered engines, it has a built-in propellant that uses aluminium powder as the fuel and ammonium perchlorate as the oxidizer.
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