What Is Inside Of A Ping Pong Ball

What Is Inside Of A Ping Pong Ball

Last modified: October 15, 2023

Who hasn’t whacked a ping pong ball across the table, reveled in the satisfying sound of the ‘smack’ when it hits the opposite end and wondered, just what’s inside this lightweight sphere that causes it bounce so resoundingly? Today, we’ll be embarking on an adventure into the heart of a ping pong ball and discover the science and construction behind its bounce.

Understanding the Basics of a Ping Pong Ball

A typical ping pong ball is fashioned from a certain type of plastic, one that is often lightweight and bounces quite easily. The brilliant whiteness of these balls is not just for aesthetic purposes but also ensures high visibility during a heated match.


According to the International Table Tennis Federation (ITTF), all sanctioned events require the use of celluloid or similar plastic balls. Celluloid is often preferred for its lightness and durability, but due to safety concerns and production issues, more and more manufacturers are shifting towards other types of plastics.


The ball is formed from two equal halves. Each half is heated and pressed into a mould to form the respective shells. The two halves are then joined together by a heat-sealing process, leaving a seamless surface that is perfect for the game.

Size And Weight

The official size of a ping pong ball is 40mm in diameter, a change that was introduced in the year 2000 from the previous 38mm to slow down the game and make it more appealing to viewers. The average weight of a ping pong ball is approximately 2.7g. This lightweight design aids in easy manoeuvrability during matches.

The Physics Behind The Bounce

Playing ping pong isn’t just about swinging your paddle. It involves a series of calculations involving inertia, momentum, and gravity, even if we aren’t consciously aware of it. The ball’s remarkable bounceability stems from its material and construction.

Internal Air Pressure

When a ping pong ball is formed, it’s typically done so in a high-pressure environment. This ensures that there is more air on the inside than on the outside. This difference in air pressure is what gives the ball its ability to bounce.

Material Flexibility

Ping pong balls are created using flexible materials that have the ability to deform upon impact and then quickly return to their original shape. This elasticity essentially enables them to bounce.

Spin Factor

The rotation or ‘spin’ of a ping pong ball once it leaves the paddle can significantly influence the direction and speed of a ping pong ball. This additional twist is an integral part of the game’s strategy.

Fun Facts About Ping Pong Balls

Aside from understanding the science that goes into making a ping pong ball, there are several interesting facts to keep in mind.

Moon Landing

In 1971, astronaut Alan Shepard notoriously hit a golf ball on the moon. Pub quiz aficionados might know that he also hit a ping pong ball, demonstrating the low-gravity atmosphere’s effect on the ball was quite dramatic.

World Records

The current world record for the most ping pong balls caught in one minute using chopsticks is a whopping 40, held by Anthony Falco of the United States.

Eco-Friendly Table Tennis

The switch from celluloid to more plastic-based balls was partly driven by manufacturers wanting more eco-friendly production processes, reducing the environmental impact of table tennis.


And that’s the wonder of ping pong balls summed up! These small, innocuous items are a potent blend of material science, physics, and sports, all engineered for your gaming pleasure. Whether you’re an amateur player or a professional, understanding the basic science of ping pong balls offers a unique and enlightening perspective on this much-loved sport. So, the next time you serve that little white ball, remember, there’s more to it than meets the eye.

Additional Ping-Pong Resources:
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