that applies thrust to the craft

So you created a boat with no water

no medium is required

think about it like this

let's say

you are in space, floating, right

no gravity, for all practical purposes a vacuum

now imagine

If you think that small tube is a vacuum you are not being honest with yourself

in front of you, is a large block

if you push off the block

you and the rock will both move in opposite directions

the same is happening with a rocket engine

the fuel mixes with oxidizer and is ignited to expand in a chemical reactipno

reaction*

It cannot maintain its differential

therefore you are pushing off pressure

this moves the fuel out of the rocket chamber, essentially "pushing" against the rocket

^^

the rocket moves because of the force applied to it

not because it applies force to a medium

Good explanation

Couldn’t have said it better

Notice the rocket doesn't move until it has created smoke

false

the smoke is from the burning of fuel

kind of what happens

the engines have to throttle up first

Start at 2:20

so you get some fumes

go into slow mo

the rocket is also

restrained

As soon as the jet stream starts, you can see thrust

so that the engines can throttle up

I've been through this video many times

it is then released from clamps

and if its engines produce more thrust than it has gravitational attraction to the earth

it will immediately begin moving upwards

the smoke has nothing to do with a pressure differential

There is ZERO thrust until a medium is created