The ball
Ball whether ball, inaccurately also balloon, is round (For some Sports and purposes can be and coned) subject used in many sports and games. Is usually made from leather, Rubber or Plastic mass. Balls are mostly hollow, filled Compressed air and Round. To discharge Balls air with uses pump. Balls mohout be and shape Cones (Only in some cases - e.g. rugby, American football or Australian Football) or can be completed (Medicine ball). Children in past used as compensation Balls hadr�k. These with about ball made from old hose and completed rags. Ball with sometimes called balloon.

Balls were used to Games already in Antiquity in Egypt Greece and Rome and Aztecs in Medium America. During centuries with developed large quantity different ball games.

Footballs
Balls logo FIFA undergo comprehensive testing. Look what has soccer ball with stamp FIFA Inspected or FIFA Approved meet:

first Circumference of the ball
A good estimate of the flight path must have a ball constant circumferential extent. The circumference is measured at ten different locations. These measurements are used to calculate the average circumference. Balls logo FIFA Inspected must have this value 68-70 cm, FIFA Approved balls must have continuity between 68.5 and 69.5 cm. & Nbsp;
second The roundness of the ball
Inaccurate networks can deform the ball. The diameter is measured at sixteen locations. From these measurements, the average. Two limit values ??can be distinguished from an average of only 2% (at balls to mark FIFA Inspected), or even by only 1.5% (FIFA Approved).
3rd Flank hotels The ball is allowed to fall ten times onto a steel plate from a height of two meters. FIFA Inspected ball must bounce to a height of 115 cm to 165 cm, FIFA Approved only 120 cm to 165 cm. The difference between the offsets may not be greater than 10 cm.
4th Weight hotels Each test ball is weighed three times in a special container. This container is sealed so that any leakage of air from the ball did not affect the weighing. FIFA Inspected ball should weigh between 410 and 450 g. Balls FIFA Approved with stamp should weigh between 420 and 445 g.
5th Water Absorption
In this test, the ball rotates and is 250 times immersed in a container with 2 cm of water. FIFA Inspected balls can absorb more than 15% of its original weight. FIFA Approved may absorb only 10%.
6th Pressure loss hotels Behavior ball which loses pressure during a game, it is difficult to predict. In this test, the ball is inflated with air to a pressure of one atmosphere. Three days (72 hours) the pressure in the ball again p�em��uje. The ball could wear 'em FIFA Inspected, must not lose more than 25% of the initial pressure. FIFA Approved balls must not lose more than 20%.
7th Stability shape and size
In this test, the ball is fired 2,000 times against a steel sheet speed of 50 km/h. Seams and soul that must withstand test unscathed. The pressure loss and change in shape and circumference of the ball must be minimal. This test only undergo balls with FIFA Approved seal.
8th Balance Balls hotels In this test, the ball when placed in direct direction must maintain its orbit. The ball is put into motion equal, so that it rolled over horizontal surface in a straight line and monitored how many degrees the ball deviated from its original straight path. This test only undergo ball for futsal. Balls FIFA Inspected may deviate by more than 7.5 � and Balls FIFA Approved maximum of 5 �.

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