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In summary, the volleyball officials and their roles are as follows: 1st Referee who is responsible for making the final decision. 2nd Referee who assists the 1st referee to ensure the game is played without faults. Line Judges who are responsible for signalling whether a ball has landed in or out of bounds.
Obviously an official needs a way of indicating whether the ball landed in or out of the court. Especially in situations where it is tight to the line and could go either way. An official would indicate that the ball landed in court by placing their arm at a 45 degree angle between the hip and shoulder and then pointing with their full arm and hand to the side in which the ball has landed in on.
A volleyball is a ball used to play indoor volleyball, beach volleyball, or other less common variations of the sport. Volleyballs are round and traditionally consist of eighteen nearly rectangular panels of synthetic or genuine leather, arranged in six identical sections of three panels each, wrapped around a bladder. A valve permits the internal air pressure to be adjusted. In a break from the traditional construction, in 2008, the FIVB adopted as its official indoor ball a new Mikasa with dim
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The youth volleyball ball for indoor use is 63 to 65-centimeters or 25 to 26-inches in circumference. They weigh 9.2 to 9.9 ounces, or 260-280-grams. Internal pressure of these balls are set at 4.3 psi or 0.30-kgf-per-centimeter-squared. The adult indoor volleyball ball is 65 to 67-centimeters or 25.5 to 26.5-inches in circumference. They weigh 9.2 to 9.9-ounces or 260 to 280-grams.