By no means should you try any of these things at home, even if they look like they're very simple. Having said that, I want to tell you a little about pressure. We'll start by thinking about what it means for something to be empty. P2 takes a balloon and blows in it and holds it. P1 takes the balloon from P2 and let it go.
Air is important.
Well, yeah, for breathing. I think you're missing the point here. Air is made up of gas molecules. The molecules in a gas are constantly moving. When we put the molecules in a container, the air molecules bounce off the sides of the container.