How does a rocket work in a vacuum

[Nink]

Nink

The formula for force is Mass times Velocity.  No where in that formula does it say anything about pushing against something else.  And you totally ignored my suggestion for a simple test to prove this to yourself.  If throwing a cardboard brick shape does not move you the same as throwing a real brick then that proves that pushing against air has nothing to do with it.  As the formula says, it is mass times velocity that gives the force.

Carroll with 2 rs and 2 ls

Hi Carroll

I can assure you F=MA  Please check google

[pomodoro]

Gases are like balls with space between them. They need to bounce back to the rocket from air collisions to push it according to your theory.Only if the air was solid stiff  and same for the flame gases would this theory work as solids can transfer forces.
In reality the gas from the flames is detached from the rocked because gas molecules have great distances between them. Whether it hits a wall or the air , it has no way of communicating any momentum back to the rocket. Because of its great velocity it will not bounce back from any collisions with the air as only hot exhaust gases directed away from the rocket are near the exhaust.

[Nink]

Gases are like balls with space between them. They need to bounce back to the rocket from air collisions to push it according to your theory.Only if the air was solid stiff  and same for the flame gases would this theory work as solids can transfer forces.
In reality the gas from the flames is detached from the rocked because gas molecules have great distances between them. Whether it hits a wall or the air , it has no way of communicating any momentum back to the rocket. Because of its great velocity it will not bounce back from any collisions with the air as only hot exhaust gases directed away from the rocket are near the exhaust.

The Gas molecules from the rocket may have a great distance from each other but the molecules in the atmosphere that they collide with do not. In the absence of an atmosphere in the infinite vacuum of space gas molecules will never collide with anything. They will just continue to move outwards. As they do not have anything to collide with there is no increase in pressure inside the combustion chamber or outside in the atmosphere. As the gas molecules heat up and expand they will simply exit the combustion chamber without a force to push against.  This is the free expansion of gas. During free expansion no actual work is done as there is no opposing force so there is no pressure that would result in the creation of work.

[lumen]

Nink:

The gas IS the mass.
The FASTER you can expel it the harder it pushes the rocket.
The MORE gas you expel the harder it pushes the rocket.

Nothing else is required.

https://www.youtube.com/watch?v=oXAil8GIUNs

[citfta]

It does appear that you are really not interested in how a rocket can work in space.  You only want to try and convince others it can't.  Sorry, but I am not going to fall for that and I don't think anyone else will either.  I am done here.

Carroll