How much does football weigh?

Adidas has designed a new match ball named "++Teamgeist" for the 2006 World Cup in Germany 18, which symbolizes the important spirit of the World Cup: the strength of the team.

The roundness and surface smoothness of football directly determine its stability and accuracy. The extraordinary feature of "+Teamgeist" lies in its revolutionary reduction of spherical tiles to 65,438+04, whereas in the past, all football surfaces were composed of 32 skins. This innovation changed the number of stitching points on the outer surface of the ball from 60 to 24, which decreased by 60%, and the total length of stitching line also decreased from 40.05 cm to 33.93 cm, which decreased by more than 15%. This modular design, combined with Adidas' unique seamless pressing technology, makes "+Team Star" show unprecedented outstanding performance. Large-scale comparative experiments in Loughborough University in England and Adidas Laboratory in Schinfeld, Germany have proved this point.

Many stars have taken the lead in trying out this brand-new ball for the World Cup. Beckham commented: "The team star is one of the most beautiful balls used in the World Cup, and I like it very much!" Raul said: "I think this'+team star' is the most perfect one among all Adidas football. Her design is very unique. Whether it is cutting the ball or shooting, she is very handy with the ball. "

"+Team Star" is a combination of tradition and innovation. It uses three colors: black, white and gold. Black and white are the traditional colors of the host German national football team, while gold represents the World Cup trophy. As we all know, in 1974, FIFA decided to award the 18K gold trophy to the World Cup champion for the first time. Coincidentally, the World Cup was also held in Germany, and the final champion was won by the host country. As a captain, beckenbauer won the first World Cup trophy. As a commemoration of the great moment in the history of German football, the host of the 2006 World Cup, Adidas designers chose the traditional colors of German team uniforms-black and white, as the main colors of the ball for this World Cup. The spiral gold hook on the sphere was inspired by the gold medal trophy of the World Cup.

On April 18, 2006, beckenbauer, President of the German Organizing Committee for the 2006 World Cup, showed the ball for the World Cup to the public. On the same day, at the exhibition held in front of Brandenburg Gate in Berlin, Germany, the German World Cup ball "Team Star" appeared. The diameter of this ball is 2.2 meters.

Golden football will be used in the World Cup final on July 9th. There is no difference in the material of the golden "team star", except that six of the ball skins of 14 will be painted gold.

During the World Cup in Germany, 15 balls in each match will be specially treated, and the names of the opposing sides, the stadium, the date of the match and the kick-off time will be printed on the football. The top 32 players in the World Cup will also get 20 ordinary match balls for adaptive training in the near future.

It is reported that "+Teamgeist" will be sold in Adidas stores around the world from 65438+February 10, which is expected to break the previous sales record of football.

FIFA has formulated a series of strict rules in determining the match ball to ensure that the best football is provided to the best players in the world. Only after a series of rigorous tests can a football that meets all the standards be marked as "qualified by FIFA". However, a number of tests conducted in the Adidas Football Laboratory in Schinfeld and the test center of Loughborough University show that Adidas "+Teamgeist" not only fully meets the "FIFA-recognized qualified" standard, but also far exceeds the requirements of FIFA standards in various standards.

Mechanical leg trial kick:

Adidas Football Laboratory in Scheinfeld has developed a set of high-tech soccer mechanical legs, which can be used in various soccer tests and can repeatedly hit the ball at the same angle with the same speed and strength. The special test of mechanical legs shows that Adidas "+Team Star" (+Teamgeist? ) 30% more accurate than other top football teams participating in the test. While testing the robot's legs, a high-speed camera was set up in parallel near the hitting point to record and analyze the impact of kicking on football. The video shows that Adidas "+Team Star" eliminates the irregular bumps on the football surface to the greatest extent because of its unique design of 14 leather block, so the performance of the football remains unchanged no matter where it is kicked.

Sphere circumference test:

The consistency of the circumference of a sphere is one of the important characteristics of football. Perfect spheres with the same circumference can make players pass the ball better and control the operation of football. In order to calculate the average sphere circumference of football, each Adidas ball is measured by 10 different sphere test points. The following are the test results:

Qualification standard recognized by FIFA: 68.5cm-69.5cm

Adidas "+Team Star": 69.0cm-69.25cm.

Durable sphere test:

A perfect round ball football can help football players show their superb football skills. The closer the football sphere is to the perfect circle, the more stable and accurate the performance of football in flight, and the stronger the predictability of football flight. The brand-new special-shaped square design can better transmit the power of the kicker and effectively reduce the angle of the target area formed after the football flies out, while the larger square of the football sphere can provide more and better kicking points for the players.

Adidas measured the diameter of football through different spherical points on 16, and calculated the average diameter of football. FIFA has strict regulations on the difference between the maximum diameter and the minimum diameter of a football sphere.

The following are the test results:

Qualification standard recognized by FIFA: the maximum difference does not exceed 1.5%.

Adidas "+Team Star": The maximum difference is less than 1.0%.

Water absorption test:

A wet football and a dry football show completely different performances. Wet-weight football flies slower and bounces lower, making it more difficult to kick the spinning ball. Adidas' unique thermal bonding technology makes Adidas football highly waterproof. And for adidas "+teamstar" (+teamgeist? The test results show that its performance is completely consistent in dry or humid environment.

The water absorption test of football is to squeeze and rotate the football 250 times in a container filled with water, and then weigh the football. The water in the container will also be weighed before and after the water absorption test.

The following are the test results:

FIFA's water absorption approval standard: the weight gain of the sphere shall not exceed 10%.

Adidas "+Team Star" absorbs water: the weight of the sphere does not increase by more than 4.5%.

Weight test (420-445g):

Every professional game needs to use several footballs, and every football used in a game requires the same performance. The consistency of football weight is very important. If the football is too light or too heavy, the flying angle and route of the football will be difficult to predict.

The following are the test results:

Fifa recognized eligibility criteria: the weight of football is between 420-445g.

Adidas "team star": the weight of football is between 44 1-444g.

Ball shape and size retention ability test;

A football is played about 2000 times in a game on average. However, we need the performance of football to be consistent from the first minute to the last minute of the game.

In order to test the ability of football to keep its shape and size, the standard approved by FIFA requires that football hit the steel plate 2000 times at a speed of 50 kilometers per hour. After this test, the ball pressure and the curvature of the ball are only allowed to change slightly, and the joint between the ball valve and the ball is not damaged before it can be used in the game. The following are the test results:

Fifa approved eligibility criteria: 2000 impacts at 50 km/h.

Adidas "+Team Star": 3500 hits at 50km/h.

Roller test:

Roller test is a special test for the quality and durability of the unique printed surface of Adidas football by the innovative team of Adidas Company. Adidas "+Team Star" (+Teamgeist? ) is the first football made by fully embedded printing technology, which makes its surface material have the best durability, thus ensuring the appearance of the ball pattern.

Unique rebound performance test:

Football players need to be able to predict and master the rebounding performance of football well when using their chest, thighs and feet to control football or pass people.

In this unique test, the football will fall on the steel plate many times from a height of 2 meters. The height difference between the highest and lowest after the rebound of football cannot exceed 10 cm. The following are the test results:

Qualification standard approved by FIFA: no more than10cm.

Adidas "+team star": no more than 2 cm (the rebound height at 20 degrees is 143- 145 cm).

(The rebound height is 135- 136 cm when the ambient temperature is 5 degrees)

Ball pressure test:

If the pressure of football is reduced during the game, it will be difficult for players to predict the running direction and trajectory of football, and football can not meet the requirements of consistency of rebound effect. The change of football ball pressure directly affects the success rate of long pass and bottom pass.

In this test, the football was completely inflated and put aside, and its ball pressure was measured three days later. Fifa stipulates that the reduction of football ball pressure cannot exceed a specific ball pressure ratio. The following are the test results:

Fifa recognized eligibility criteria: the ball pressure drop should not exceed 20%.

Adidas "+Team Star": the ball pressure drop does not exceed 1 1%.