The reason the balls are labelled with 40+ is that when the ITTF made the plastic balls legal for competition, they also allowed the balls to have a bigger size tolerance. So a celluloid ball tends to be around 39.6mm whereas the new plastic balls measure around 40.2mm, making the plastic balls about 0.5mm bigger.
Likewise, do ping pong balls come in different weights?
Ping pong ball weight
ITTF-approved table tennis balls must weigh 2.7g. But there’s an accepted tolerance of between 2.67 and 2.77g. Lighter ping pong balls are slower and more likely to wobble, whereas heavier balls are faster and more stable in their trajectory. … For example, these KEVENZ balls weight 2.75g.
In this way, what is the mass of ping pong ball?
How many times can a player serve in a row of table tennis?
The simple answer is that there’s no limit on the number of times you can replay the service when it has hit the net. Rule 2.09 states that it shall be a let “if in service the ball touches the net assembly, provided the service is otherwise correct or the ball is obstructed by the receiver or his or her partner”.
Changes to table tennis balls. There has been two significant changes to table tennis balls over the past 20 years. In 2000, the size of the ball was increased from 38mm to 40mm. … These balls are a tiny bit bigger than the 40mm celluloid balls, but the main difference is the type of material they are made from.
The official table ping pong ball has changed over the years from a composition of celluloid to polymer and from a size of 1.5” (38 mm) to 1.57” (40 mm).
Why is that? Assuming round ping-pong and bowling balls are stack perfectly on one another, let’s do the math. According to google, a ping-pong ball weighs 2.7 grams (0.00595248 pounds) and is 1.57 inches in diameter. Therefore, 1,000 pounds of ping-pong balls is equivalent to 167,997 total ping-pong balls.