Table tennis is spherical. Before the Sydney Olympic Games in 2000 (including the Sydney Olympic Games), the diameter of the international competition ball was 38mm, and after 2000, the diameter of the international competition ball was 40 mm, which was played on a table with a horizontal net in the middle, with a length of 274cm, a width of 152.5cm and a height of 76cm. The diameter of the ball is 40.00 mm and the weight is 2.53-2.70 g.. It is white or orange and made of celluloid or plastic.

So now the diameter of table tennis is 40 mm

On-site requirements for table tennis:

Regional facilities:

The Olympic table tennis competition will be held in the gymnasium. The specific standards of the gymnasium are as follows:

Including a formal competition venue with a standard size (8m wide,16m long, ceiling height not less than 4m) that can accommodate 4 or 8 tables (depending on the competition mode), and the competition area should also include the channel beside the competition table, electronic display screen, seats for athletes and coaches, and competition official area (technical representatives, referees, arbitrators, etc.). ), photojournalist area, TV camera area, award area, etc.

The floors of exhibition halls and table tennis courts should be made of wooden floors or movable plastic floors of brands and types recognized by ITTF. The floor is elastic, and there are no other signs and traces of movement. The color of the floor should not be too light or reflective, but red or crimson. Don't use too much oil or wax to avoid slipping.

Indoor temperature, the air flow in the competition area of table tennis hall is controlled at 0.2~0.3m/s, and the temperature is about 20~25℃, which is 5℃ lower than the outdoor temperature.