It says how much to inflate it on the ball. or at least it should.
All the air inside of it will inflate.
Physical
The pressure inside the balloon has to exceed the pressure outside the balloon.
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.
psi is a pressure and pound is a mass or weight. That is like apples and bananas. EDIT: I think the question refers to a basketball. For example, on my basketball it reads: "Inflate 7 to 9 LBS". This is very confusing indeed, with no mention of pressure. However, they actually mean, in this case, "LBS per square inch" - I don't know why it's not specified, but POUNDS in this case means POUNDS PER SQUARE INCH. Hooray for strange ways of specifying pressure!
It will eventually go boom
Inflate your tires to the proper pressure and then drive the vehicle
to drink, to inflate tires, to spray etc
That depends how much you inflate it.
Aircast that puts pressure on your foot by using your pump to inflate or deflate it.
Low pressure.