According to the requirements for "The Ball," it must be spherical and inflated to a pressure of between 8.5 and 15.6 psi. When a soccer ball has less than 8.5 psi of inflation, it is more difficult to kick and propel down the field, and it is considered excessively flat. A ball that is overinflated to 15.6 psi can be dangerous because it is more likely to explode if struck by a foot or head.
The volume of a sphere is calculated by multiplying the radius of the sphere by three-dimensional space. For example, a ball that is one inch in diameter needs to hold 69 cubic inches of air to be properly filled. This means that if you could remove all the air from such a ball, it would fall six inches to the ground.
Soccer balls are usually around 110-120 degrees when fully inflated. This means that if you were to put a pin through the middle of the ball, two opposite points on the ball's surface would be exactly opposite each other - which isn't possible to do so there would need to be some space within the ball where these points overlap a little.
This space is what allows the ball to retain its shape. If you were to completely fill a ball with water then it would be impossible to play soccer with because there would be no space left to roll around in. However, this is what gives it its resilience too.
FIFA, the governing organization of international soccer, creates the rules that govern international soccer competition. The more tightly the ball is sealed when filled with air, the less likely it is to become unballistic during play.
A soccer ball needs air to be viable. As gas bubbles disperse throughout the rubber shell of the ball, they help keep it light and responsive to touch. You need about 1/4 of its volume of air to be safe. One way to estimate how many cubic inches of air are in your ball is to measure the diameter of the ball at its largest point - usually just after it has been molded - then divide by 2.5. This can be done by taking the measurement with a flexible tape measure or using a rigid ruler and a compass.
Soccer balls range in size from 10 to 20 inches in diameter, but there is no standard size for this type of ball. The number you obtain by dividing the diameter by 2.5 is called the ball's "delta value." For example, if the ball is 14 inches in diameter, you would divide 14 by 2.5 to get 5.12, which means there are 5120 cubic inches of air inside this ball.
All three sizes of soccer balls have the same ball pressure. Although there is a broad range of allowed pressures for a soccer ball, it is the official norm of FIFA, the Federation Internationale de Football Association. The pressure should be such that you can squeeze the ball between your hands without it falling apart.
The size of the ball affects how it is played. Sizes of balls vary by league but generally there are small soccer balls for younger players and larger ones for older players. There are also indoor soccer balls which are only available in certain leagues and venues but they are similar to other outdoor balls in terms of design and construction.
Indoor balls are usually smaller than their outdoor counterparts because less space is available when playing on a flat surface. This makes games played on a indoor pitch or court shorter with more frequent breaks for rest before moving onto the next point. Outdoor balls are generally bigger because the game is not restricted by space and players can take advantage of open areas outside of the court or field.
There are different techniques used to play with a soccer ball, such as dribbling, passing, and shooting. All these actions are affected by the size of the ball so professionals can choose what kind of game they want to play based on the size of the ball.
According to FIFA regulations, the air pressure of a legal ball must be between 8.5 and 15.6 psi. Referees inspect the ball before each game to ensure it is fit for play. If it is not, they call a foul on the team that was about to use it.
A filled basketball returns to its original size when it is put in water. For this reason, most children's balls are filled with around 20-30 pounds of air because they have to be large enough to accommodate young muscles and bones but not so heavy that they sink to the bottom of a pool or lake.
As adults get stronger, they need a ball that has more air inside it. Major league baseballs range from 26 to 32 inches in diameter, and they usually weigh between 315 and 355 grams. That means that each one contains between 1020 and 1140 cubic centimeters of air.
Soccer balls are usually between 12 and 16 inches in diameter, and they can weigh between 400 and 500 grams. That's enough air to fill a room about 0.37 meters wide by 0.23 meters high.
The volume of a sphere is calculated using the formula: πr²h where r is the radius and h is the height.