Experiments show how exploding balloons and unexpected applications

In your opinion, how many ways will balloons fly?

Many of us must have experienced the feeling of "heartbeat" when the balloons holding hands suddenly exploded.

Startled .

Ignoring the story of feeling and noise, do you know what it looks like when balloons explode? Experiments of Mokhtar Adda-Bedia and Sebastien Moulinet of Paris Diderot University will tell you this.

According to Mokhtar's experiment, the ball will explode in two ways depending on the tension of the ball.

First, consider the case of low tension. When the ball is breathed in, the air will create even tension on each area of ​​the balloon. If the tension at this time is not enough to cause the ball to burst, the ball will break in a long way as shown in the picture below.

From another perspective:

However, when the air is pumped in too much - in other words the ball has reached its limit of tension, the ball will burst according to another pattern when punctured.

Or it looks like this:

We can see that when the limit is reached, there will be many tears appear on the ball, making the ball seem to crumble.

Explaining this phenomenon, the two scientists knew it was related to the rate of sound propagation in the material . When the ball reaches its limit, this means that the tearing speed will reach the maximum. However, this speed cannot exceed the speed of sound transmission in rubber - about 570m / s.

Moulinet said: "If the speed of the tear exceeds the speed of sound, the material will not react in time when the tear appears - that is, it is not timely to adjust the pressure and physical properties. , it will break in a single line. "

Meanwhile if the tension is not enough, the speed of sound transmission in the ball will not reach the maximum speed, so the speed of the tear may exceed the speed of sound.

Glass doors may not crack like this in the future.

This means that if you adjust the sound propagation velocity in the material, you can adjust the tear so that it is more secure, not only for bubbles, but also for glass or metal - those The material has very high sound velocity.

Scientists hope that this finding could help create new materials that don't crumble when exposed to unexpected effects.

The following video will help you better understand this experiment: