Eli5 how decreasing the diameter of the nozzle (of a rocket for example) makes the rocket go faster? It’s still the same amount of gas exiting the rocket no matter the diameter, so why is there a difference?
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Think of a balloon.
If you blow it up and let it go without tying it, it will fly across the room.
Now if you take another balloon and cut the end of so it’s bigger, then blow it up and let it go, it won’t go as far.
A smaller hole creates more resistance to whatever’s under pressure.
Pop your balloon and it won’t go anywhere.
Why? No resistance.
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