What is the diameter of a standard Ping pong ball?

　　Ping pong is a globally popular ball sport and is the national sport of the People's Republic of China. It is a skill-based sport that prioritizes technique, with physical fitness as a secondary factor. The sport originated in the United Kingdom. The name "Ping pong" was coined in 1900, derived from the sound "ping pong" made when the ball is struck. In Mainland China, Hong Kong, and Macau, "乒乓" is its official name.
　　What is the standard diameter of a Ping pong ball?
　　The regulations specify the range of diameter variation, hardness, roundness, eccentricity, bounce, durability, and appearance of Ping pong balls; the factory inspection in the inspection rules follows the GB/T 2828.1 special inspection level S-3 normal sampling plan; requirements for ball weight, roundness uniformity, and consistency (standard deviation) are set for high-quality balls used in international competitions. The China Light Industry Federation proposed centralized management by the National Sports Goods Standardization Center.
　　The diameter of international competition balls after 2000 is 40mm, while before 2000 and including the Sydney Olympics, the diameter was 38mm. Ping pong balls are spherical, with a diameter of 40.00 millimeters, weighing 2.53-2.70 grams, white or orange in color, made of celluloid or plastic.
　　The significance of Ping pong
　　It can effectively improve people's physical fitness. Long-term participation in Ping pong, along with continuous economic development, expanded activity time, and increased exercise volume, can correspondingly improve work speed quality, strength quality education, as well as students' physical sensitivity and coordination. It also helps muscles become developed, strong, firm, and joints more flexible and stable.
　　When playing Ping pong, the ball flies very fast in the air, taking only 0.15 seconds for a forehand to reach the opponent's table. Within such a short time, athletes are required to comprehensively observe the ball's direction, spin, force, and landing situation during high-speed movement, quickly judge, take timely countermeasures, move their steps rapidly, adjust position and the surface angle of the paddle, and make reasonable returns. All these teaching activities are conducted under the brain's command. Regular Ping pong practice can greatly improve the reaction speed of the neural network system.
　　It can improve psychological quality. Ping pong is a competitive sport. Due to intense competition, the conditions for success or failure often change, and participants' emotional states are complex. At the same time, during matches, understanding the opponent's tactical intentions and mastering one's own tactical and technical application allows practitioners to develop and exercise their psychological health quality well.
　　It can promote student communication and enhance friendship. Through participating in Ping pong, we can exchange experiences, learn from each other, progress together, and establish good interpersonal relationships.

Service:+86-572-5816723
Fax: +86-572-5816487
Email:hzshuguang@vip.163.com
Address: Tianzi Lake Industrial Zone, Anji County, Huzhou City, Zhejiang Province