Soccer ball – this is the universe. If scientists believe NASA (do not believe they have no reason), the universe is shaped like a soccer ball, consisting of a slightly curved pentagons in space. That is, it – our universe – does not infinite, or infinite infinity of very different: coming out of the universe-ball, the researcher will be in it the same, only exactly the opposite direction. Ball game – the oldest team game mankind. Several thousands across the globe there versions of the game, reminiscent of modern football. Soccer balls, ie balls for the game legs were made of leather, bark, silk, straw, leaves, resins, bovine, porcine, cow bladders. Balls were of different sizes and densities.
Manufacturing technology of football has changed in the 19th century with the discovery of vulcanized rubber. See more detailed opinions by reading what Center for Responsible Business offers on the topic.. Since then, football was an inflatable rubber camera. Football myachsostoyal from the camera and leather tires. Tire collected from 18 panels. Most modern footballs are made of 32 panels waterproof, 12 of which have a pentagonal shape, 20 – hexagonal. In 2006, Adidas, the company first stepped on this principle, creating a 14-panel ball Teamgeist. Sheathed soccer balls have long been the skin. The skin, however, is not suitable material for the ball that bounces on the damp ground.
The skin absorbs the moisture. In currently used material PU (polyurethane) or PVC (polyvinyl chloride). The inner layer between the camera and the tire is a soccer ball lining. On its thickness depends on the quality of the ball. The modern ball has to four or more pads of polyester or pressed cotton. Standard size and weight football were established in 1872: the amount of 68.6 to 71.7 cm, weight of the ball can vary from 368 to 425 grams. In 1937, the mass of the ball was increased to 410-450 grams and has since remained unchanged. There are 5 size soccer ball. The first two dimensions are used to promote and educate children from four years. The third size is less than 340 g and 61 cm They are children of 8 years. Fourth the size – for children aged 12 years or for mini-soccer: 369-425 grams, circumference – within 63,5-66 see footballs fifth the size is greater than all others combined. Fifth the size of a soccer ball is for official competitions under the auspices of FIFA throughout the world. Fifth the size: it has a circumference of not more than 70 cm (28 inches) and at least 68 cm (27 inches) at the start of the match does not weigh more than 450 grams (16 ounces) and not less than 410 grams (14 oz) weight indicated for dry ball, a pressure equal to 0.6 -1.1 atmosphere (600-1100 g / sq. cm.) Sports equipment