Football numbers 4 and 5 are the size numbers of football, and the differences between them are as follows:
1, different diameters.
The diameter of No.4 ball is 19 cm, the diameter of No.5 ball is 2 1.5 cm, and the diameter of No.5 ball is larger than that of No.4 ball.
2. The types of competitions are different.
Ball No.4 is a special ball for 5-player or 7-player games, and ball No.5 is the official ball for regular 1 1 player games.
3. Use different venues.
The No.4 ball is generally used for indoor competitions, and the No.5 ball is used for grass competitions.
Extended data
Football, with the reputation of "the first sport in the world", is the most influential single sport in the world. In a standard football match, the two teams each sent 10 players and 1 0 goalkeepers, a total of 22 people, to fight, defend and attack on a rectangular grass court.
The purpose of the game is to shoot the football into the opponent's goal as much as possible, and you can get one point for each goal. When the game is over, the team with more points wins. If the score is the same within the specified time, it depends on the rules of the game. You can draw lots, play overtime or exchange penalties (12 yards) and so on. In the football match, except the goalkeeper can touch the ball with his hand in his own restricted area, each player can only control the football with other parts of his body except his hand (except the foul ball).
Official ball
The ball for competition should be round, its shell should be made of leather or other recognized materials, and materials that may harm athletes should not be used in its structure.
The circumference of the ball shall not be greater than 7 1 cm or less than 68 cm. At the beginning of the game, the weight of the ball should not exceed 453 grams or less than 396 grams. After inflation, its pressure should be equal to 0.6- 1. 1 atmospheric pressure (sea level), which is equivalent to 600- 1 100g/cm'. During the match, the match ball shall not be changed without the permission of the referee.
Resolution I of the International Council
1. The match ball is the property of the association or club to which the venue belongs. At the end of the game, the ball should be given to the referee.
2. The International Council decides the materials for making balls at any time. Any licensed materials must be approved by the International Council.
According to the rules approved by the International Council, the equivalent weight of the ball is 14 to 16, that is, 396 to 453 grams.
If the ball is broken or missed in the game, you should stop the game immediately and start the game with a new ball where the original ball was broken. Unless the ball is in the goal area at that time, in this case, the game should be resumed by landing the ball on the goal area line nearest to the ball and parallel to the goal line when the game stops.
5. If the dead ball leaks, use a new ball according to the corresponding referee, and change the dead ball for the ball.
6. Failure to do so will be considered as no substitute.
References:
Baidu Encyclopedia: Football