13 p.s.i.
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A football is typically inflated to a pressure of around 12.5-13.5 psi (pounds per square inch). However, the specific pressure may vary slightly depending on personal preference and playing conditions.
1 kg/sq cm = 14.2233 psi 140 kg.sq cm = 140 x 14.2233 psi = 1991.262 psi
That would be to deflate it.
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!
There is no mathematical conversion needed - 1 psi is equal to 1 psi. The terms "psig" and "psi" are often used interchangeably to refer to pounds per square inch of pressure. However, "psig" specifically denotes pressure relative to the local atmospheric pressure, while "psi" is an absolute measure.
1 kilonewton is equal to 1000 newton.