psi is Pounds per Square Inch...so 9 pounds per square inch. For example, basketballs typically read: "Inflate 7 to 9 LBS" which is confusing. They actually mean 7 to 9 PSI, for some reason. So, yes, inflate your basketball to 9psi.
40 - 60 psi
about 2350 psi or 16.2 MPa
Multiply psi by 144 to get psf.
1kg equal to psi
yes, the less psi the less it bounces. Don't inflate it too much or it will pop, it usually says how much psi on the ball.
32, to 35psi
You have to inflate a football that you want to play with beecause you won't be able to kick it otherwise.
Look on one of the tires for a MAX PSI number and inflate them to less than this number.
you use a football pump and pump it up. =]
For an Association football, 8-12 psi. For an American football, 12.5-13.5 psi. For an Australian football, 9-11 psi.
A properly inflated grid iron football holds 13 psi of air.
9.0-11.0 psi - [Ref. "Football (ball)" - Wikipedia]
Read the sidewall of the tire for the Manufacturers specification...
if you are asking about an average American football 8-12 psi or .6 to .8 bars