Question

Rocket can move in air free space, but jet planes cannot. Why?

Answer 1

Rocket:

1. A rocket is a space vehicle or an engine that is meant to move a vehicle into the air.
2. It contains an engine that releases the fuel in the opposite direction and provides a thrust to the rocket so has to move upwards and eventually out into space.
3. The thrust provided is such that the rocket can gain a velocity that is more than the escape velocity of the earth, which is $11km/s$.

A diagram to represent the rocket:

Jet plane:

1. A jet aircraft is an aircraft moved by jet engines.
2. These engines operate using the dynamics of air for propulsion and lifting.
3. But, in space, there is only vacuum, which makes the engines of the jet fail.

A diagram to represent the jet plane:

Hence, jet planes use atmospheric oxygen for their fuel but rocket carries their own fuel and doesn't depend on atmospheric oxygen.