It says how much to inflate it on the ball. or at least it should.
All the air inside of it will inflate.
That all depends how much helium you put in it. A basketball should be able to take the same amount of pressure, whether it's pressure from air or helium. So, if you inflate it only to the recommended pressure, it should be a problem. The same amount of pressure of helium will be less mass, so in the end the basketball will be lighter, as you would probably expect, by a very small amount.
The pressure inside the balloon has to exceed the pressure outside the balloon.
It will eventually go boom
Inflate your tires to the proper pressure and then drive the vehicle
Your lungs themselves do not inflate/deflate. The diaphragm and intercostal muscles contract and expand the chest cavity. This expansion lowers the pressure in the chest cavity below the outside air pressure causing air to flow in through the airways and inflate the lungs.
A baseball is not inflate-able like a basketball, football, soccerball, volleyball or tennisball. Those particular balls are hollow with air. A baseball and softball are filled with cork and string.
That depends how much you inflate it.
Aircast that puts pressure on your foot by using your pump to inflate or deflate it.