The difference between propel and propulsion is propel is to push or drive forward something.
Propulsion is the act or the process of driving or pushing something forward.
Propel is the action of creating propulsion and propulsion is the state of being propelled.
Basically propel is to cause to move or sustain a motion and propulsion is the process of driving or propelling an object.
An example of propulsion is a rocket engine that launches a spacecraft into space.
To create propulsion the burning of fuel creates hot gas which is then expelled through a nozzle to generate the thrust needed to propel the rocket forward.
Any exact which pushes an object or something to move including a car engine driving a vehicle or even a person that is walking by pushing off the ground are also examples of propulsion.
When you drive your car the engine burns fuel which turns makes the engine run and turn the engines crankshaft to engage with the transmission to propel the car forward down the road.
Essentially propulsion is simply the act of driving an object forward or pushing an object forward.
When you pedal a bicycle you're propelling the bicycle forward with your feet on the pedals.
A propulsion system also uses a source of power to create thrust.
This thrust then pushes against an object like a car, airplane, rocket etc to move it forward.
The amount of thrust that is created depends on the mass flow through the engine and also the exit velocity of the gas.
Walking, flying and airplane, launching a rocket and driving a car or other vehicle are all examples of propulsion.
There are several types of propulsion systems which include rocket propulsion systems, electric propulsion systems, gas turbine engines and internal combustion engines.