بالون الأطفال يعمل عمل الصاروخ دافعا ، رافعا .. كتاب في سبيل موسوعة علمية

Children's balloon works like a rocket
Pushing, lifting

This is a rubber balloon filled with air, which is why it inflated when we blew it with air. Its walls from the inside are under the pressure of this air, which is equal pressure in every direction as long as the boy holds his nozzle in his hand, preventing his air from coming out of it.
Then it seemed that the boy relaxed his fingers, allowing air to escape. So what happens?

Then the pressures on the inner balloon wall vary. The remaining ones push the balloon up and the ones that push it to the sides (the latter are neutral and mutually exclusive). As for what pushes it down, it does not exist.

So, of these pressures, there remains only one effective pressure, which is the one that acts on the wall of the balloon upward, so it pushes the balloon upward.

The result of the air (gas) escaping downward is that the balloon moves upward (in a direction opposite to the direction of the gas).

This is exactly the work of the rocket: the combustion gas comes out of it, rushing in one direction, and it moves it in the opposite direction.

(The balloon was released by the boy: his air, so there was nothing left of the pressure of his air except the pressure that pushed him upwards, while the air came out of it downwards)

(The balloon has the boy holding its air, so the air pressure is distributed evenly on its sides)