The ball is:
Source - Fifa.com
URL: See link below.
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Actually, Recent studys have shown the lower the pressure the farther it goes, But the higher the pressure the better the bounce. I would have to go with lower pressure but not too low.
The recommended pressure for a size 5 soccer ball is between 8.5 - 15.6 lb/in2 (600 - 1,100 g/cm2).