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Regulation size and weight for a football is a circumference of 68–70 cm (27–28 in) and a weight of 410–450 g (14–16 oz). The ball is inflated to a pressure of 0.6–1.1 bars (8.7–16.0 psi) at sea level. [20] This is known as "Size 5". Smaller balls, Sizes 1, 3, and 4, are also produced for younger players or as training tools. [20]
Adidas Tricolore, the official ball for the 1998 World Cup. Law 2 of the game specifies that the ball is an air-filled sphere with a circumference of 68–70 cm (27–28 in), a weight of 410–450 g (14–16 oz), inflated to a pressure of 0.6 to 1.1 atmospheres (60–111 kPa or 8.7–16.1 psi) "at sea level", and covered in leather or "other suitable material". [7]
The football changed in 1934, with a rule change that tapered the ball at the ends more and reduced the size around the middle. This new, sleeker ball made it much easier to handle, particularly for passers, while at the same time making the drop kick unreliable and obsolete. [ 5 ]
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A standard football game consists of four 15-minute quarters (12-minute quarters in high-school football and often shorter at lower levels, usually one minute per grade [e.g. 9-minute quarters for freshman games]), [6] with a 12-minute half-time intermission (30 minutes in the Super Bowl) after the second quarter in the NFL (college halftimes are 20 minutes; in high school the interval is 15 ...
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The Adidas Tango 12 (Polish pronunciation: [ˈtaŋɡɔ dvaˈnaɕtɕɛ]) was the official match ball of the UEFA Euro 2012, [1] with variants being used for the 2012 Summer Olympics. The ball is named after the original and successful Adidas Tango family of footballs from the late 1970s, but the construction of the Tango 12 is completely different.