to check if a Basketball or any ball is inflated properly, the referee must bounce the ball on the floor to see if it comes back up to a appropriate height for the players. :)
No foreign substance is allowed on the ball. The referee certifies the ball for game play. As a referee I would require the ball to be cleaned of mold or I would not allow it for game play.
The type of air that keeps a beach ball inflated is kinetic energy.
An NFL size football is inflated to 7-9 lbs that's all i know. Update: Actually, a correctly inflated ball is filled with air to a pressure of 12.5-13.5 psi.
If the ball accidentally hits the referee during a direct free kick, the referee will stop play and restart the game with a dropped ball at the spot where the referee was hit.
The best food to eat before a basketball game is soul food
If it is a solid rubber ball it is not inflated. A hollow ball can be inflated. The more pressure inside, the "harder" the ball will be and the higher it will bounce. To much pressure and you risk rupturing the "rubber" bladder.
When the ball goes out of bounds in a game, the play is stopped, and the referee will signal for a stoppage. The game resumes with a throw-in, corner kick, or goal kick, depending on how and where the ball went out. The team that did not touch the ball last before it went out will typically take the throw-in or kick. Players must be positioned correctly, and the game restarts once the referee gives the signal.
The referee determines if the ball is in or out of play based on whether it has crossed the boundary lines of the field. If the entire ball has crossed the line, it is considered out of play.
Hockey
When air leaks out of an inflated ball, gas particles within the ball escape through the opening. The pressure inside the ball decreases as more gas particles leave, causing the ball to gradually deflate.
A trick to taking out the wrinkles from a soccer ball that has not been inflated for a while is to let some air out of the ball. Then, air the ball up again while heating the ball with a hair dryer.
I can give you several sentences.He is going to referee the ball game.The referee blew his whistle for half time.They fought for half an hour with no referee.