Flat earth - air pressure/gravity?

[Logica77]

This is purely a logical argument regarding our atmospheric air pressure and the validity of gravity.

- Air pressure and density are directly correlated, one directly affects the other.

- Air pressure is defined by the energetic air molecules rebounding upon a given area of resistance.

- Air density is defined by the weight of the air which is governed by the number of air molecules within a given area.

- Without the ability to create air pressure the energetic air molecules would have no point of resistance to rebound against and would continue to disperse infinitely outwards.

- Therefore the lower layer of air which is the most dense would become infinite as there would be no air pressure to contain the outward energetic movement of the air molecules.

-This would also apply to the other layers of varying densities which would all expand infinitely with no air pressure to contain them.

- We can observe and measure sustained air pressure therefore that indicates that there must be a point of resistance somewhere.

-We can observe and measure the various layers of air density within our atmosphere, which again indicates that there must be sustained air pressure in order for the layers of density to arrange themselves and again this indicates there must be a point of resistance somewhere.

- Air pressure can only be sustained within an enclosed system which creates a point of resistance for the air molecules to rebound against, this is provable and measurable.

- It is impossible to create sustained air pressure without some kind of enclosed system to create a point of resistance, this is provable and measureable.

- Therefore based on this logical analysis for sustained air pressure to exist there must be a point of resistance somewhere and we know that a point of resistance can only be created by some kind of enclosed system at work somwehere.

- This is a purely logical argument.

- We do not know the extents, what it is made of, how it came to be, but for sustained air pressure to exist there is no other possibility, unless we can observe a measurable/repeatable example of sustained air pressure maintained without any kind of enclosed system used, and that is impossible as far as we know.

Acceleration(outwith direct application of an external force) is a result of the movement caused by equalisation of density, that is why a helium balloon rises upwards towards air which is of equal density, and the reason why a brick will fall through the less dense air towards the denser earth.

If gravity existed it could not cause the helium balloon to accelerate upwards while causing the brick to accelerate downwards, as these are two completely different directions of force.

My questions are-

1.Does anyone know of any experiments which would prove if it is possible to create sustained air pressure without the use of some kind of enclosed system?

2.If gravity exists how is it possible for it to exert force simultaneously in two opposite directions? i.e the helium balloon and brick example

[Matt]

1) Yes, climb a mountain with a barometer.
2) It is not exerting force in two opposite directions. It's simply exerting more force on the brick that then the air, more on the air than the helium.

[Croydon13013]

Air pressure is defined by the energetic air molecules rebounding upon a given area of resistance.

No, the definition of air pressure is the force exerted onto a surface by the weight of the air.

- Air density is defined by the weight of the air which is governed by the number of air molecules within a given area.

Just about correct, air density is the mass per unit volume of Earth's atmosphere.

- Without the ability to create air pressure the energetic air molecules would have no point of resistance to rebound against and would continue to disperse infinitely outwards.

What?

- Therefore the lower layer of air which is the most dense would become infinite as there would be no air pressure to contain the outward energetic movement of the air molecules.

Why? This doesn't make sense.