Qualities and measurements
The 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)
- Of a pressure equal to 0.6 - 1.1 atmosphere (600 - 1,100 g/cm2) at sea level (8.5 lbs/sq in - 15.6 lbs/sq in)
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