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Unused Tube Tested

Do these experiments prove that air is matter or air exerts pressure?

1. Placing a boiling hot aluminum can in ice water.
2. Filling a test tube with water and putting a piece of plastic on it and turning it upside down.(the water does not come out)
3. Putting in air in a syringe and putting a cap on the end, later holding the cap in placegently pushing the plunger down with your thumb and releasing the plunger.
4. Putting an unused balloon inside a bottle and then trying to blow it up while the balloon is in the bottle.

2 means that there is a pressure holding the water in the tube so two proves

3 three also proves it air pus the cap out so it means it exerted a pressure

4 if u exert enough pressure it will break the bottle so 4 is also checked

1 i couldnt find the relation of it with the air i dont think it does not prove not sure

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