It would likely be a size 4. The size 5 ball is spherical, made of leather or other suitable material, of a circumference of not more than 70 cm (28 ins) and not less than 68 cm (27 ins), not more than 450 g (16 oz) in weight and not less than 410 g (14 oz) at the start of the match, and of a pressure equal to 0.6 – 1.1 atmosphere (600 – 1100 g/cm2) at sea level (8.5 lbs/sq in 15.6 lbs/sq in).
Normal atmospheric pressure is 14.7psi. For example: A soccer ball has a recommended ...
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The proper inflation pressure for a size three soccer ball is 8.5 psi to 15.6 psi. This is also true for size four and size five. (3, 4, 5 are the only official sizes of competition ball)
soccer ball size 4 air pressure
A2A: The Laws of the Game prescribe a pressure between 0.6 - 1.1 atm, which is 600–1,100 g/cm^2 or 8.5–15.6 PSI. This is for a “standard” ball (Size 5), but the Laws make no separate call-out for size 3 and 4 balls. Most soccer balls (of any size) will have a “recommended pressure” for the ball—after all, the range of “legal” pressures is quite broad within the Laws themselves.
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Air Pressure: 8.5-15.6 PSI 0.6-1.1 bar : Use for: Size 4 balls are used for players between the ages of 8 and 11 (U-8, U-9, U-10 and U-11). Size 4 balls are also used by adult players in futsal and indoor football (note that the ball material are different for these balls).
Air Pressure. FIFA laws state the air pressure in a regulation ball must be between 8.5 psi and 15.6 psi. Before every game, referees check the ball to make sure it is suitable for play. Effects of Air Pressure. When a soccer ball is inflated with less than 8.5 psi, it is more difficult to kick and send down the field and is considered too flat.
A regulation ball of size 5 must have an air pressure of between 8.5 and 15.6 PSI (pounds per square inch). (For those of you who don’t know, a regulation ball is one that has been granted a certification by FIFA for use in official matches.) The majority of footballs, however, have an air pressure value of 8.7 to 11.6 PSI.