Why does a flat table tennis ball turn back to its original shape when it encounters hot water?

Generally speaking, the volume of the object will expand when heated, and the volume will shrink when cold, the first railroad built in Britain in 1825 will use rails, which are welded together one by one, and as a result, in the hot summer, it will be bent and deformed, and in winter it will be split into several sections, water is different from other objects, below 4 degrees Celsius, it is manifested as abnormal expansion, and when the water is frozen, the volume is about 10% higher than the volume of water, which produces a great expansion force, and when it freezes in winter, the water tank is often broken due to freezing. But heat expansion and cold contraction can also be used, such as: why is it easy to peel the shell of boiled eggs when soaked in cold waterTo understand this problem, we must first know what role water plays in this process?

Among the substances we encounter, most of them, with the exception of a few, have such a physical property as "thermal expansion and cold contraction". However, the degree of elasticity of each substance varies. Eggs are made up of their hard shells and soft egg whites, yolks.

The telescoping situation is also different. When the temperature changes little or evenly, it doesn't show anything, but when the temperature changes drastically, the pace of the egg white and the eggshell is not consistent, and when the boiled egg is suddenly immersed in cold water, the cold water makes its temperature change greatly. The eggshell shrank suddenly.

The egg white is still at the original temperature and has not reduced the volume, at this time, a part of the egg white is squeezed into the empty end of the egg by the eggshell, and then, the egg white gradually shrinks due to the gradual decrease in temperature, and gradually shrinks, due to the different degrees of shrinkage of the egg white, egg shell and egg yolk, which forms the separation of the egg white and the egg yolk. Therefore, when peeled, it will not come down with the eggshell and meat.

It is the principle of thermal expansion and cold contraction. Table tennis has the nature of thermal expansion and cold contraction, as long as there are no cracks, put in the water, the concave part is heated, the air expands, the pressure increases, the table tennis ball is pressed from the inside to the outside, the table tennis ball will slowly bulge. ”

Due to the heating of the gas inside the ping pong ball, it expands and causes it to return to its original state.

1. When the table tennis ball is deflated, it will bulge up when it is put in hot water because of thermal expansion and cold contraction.

2. After the gas in the flattened table tennis ball is squeezed, the air density increases, if it is put into hot water at this time, using the principle of thermal expansion and cold contraction, the gas will quickly become larger after absorbing heat, then the table tennis ball will return to its original state.

3. Using the theory of molecular motion, when the temperature drops, the vibration amplitude of the ions will decrease, the object will shrink, when the temperature rises, the vibration of the particles will become larger, and the object will expand.

A peculiar phenomenon can be found in life, if a table tennis ball is flattened and then put into hot water, soon, the table tennis ball will return to its original state, what is the scientific principle of this?

Table tennis is a sealed space, it can rely on external force, so as to produce elastic force, once the table tennis ball is broken, his elastic state will be much less than before, but as an amateur player, the table tennis ball at this time can also continue to be used.

When the external pressure on the table tennis ball is very high, it will deform and produce depressions. No matter how much manpower is exerted, it is difficult to make the table tennis ball return to the previous round state, the table tennis ball is flattened, and the air in the table tennis ball is also compressed, but if you want it to return to its original state, you can choose to scald the table tennis ball with hot water, using the principle of air thermal expansion and cold contraction, affected by thermal expansion and cold contraction, the air in the table tennis ball will expand, and the ball will return to its original state.

The table tennis ball belongs to a sealed structure, in which the number of gas molecules must be compressed, the table tennis ball gas is squeezed, the density decreases, and the density between the gas molecules decreases, but as for the accelerated movement of the molecules in the hot water, the number of molecules remains unchanged, but the spacing between the molecules increases, and the gas density in the table tennis ball decreases, so that the volume of the table tennis ball increases, and finally the table tennis ball returns to its original state.

But this is not absolute, many people after doing experiments find that the table tennis ball has not changed back to the same as imagined, why is this?

Although the principle of thermal expansion and cold contraction can be used to restore the table tennis ball, if the table tennis ball is too depressed, it will not be saved. If there is a crack in the spherical surface of the table tennis ball, this is one of the reasons why it is difficult for the table tennis ball to return to its original state.

And you must pay attention to the table tennis balls should not be left in hot water for too long, otherwise the table tennis balls will be broken if placed for a long time.

To put it simply, table tennis balls can be restored to their original state in hot water only because of the principle of thermal expansion and cold contraction.

In fact, it is a matter of air pressure, and the air inside is heated and expanded, so it returns to its original state, which is still very effective.

This is the principle of thermal expansion and cold contraction, the air in the table tennis ball will expand when it is heated, and then the table tennis ball will return to its original state.

This is the principle of thermal expansion and cold contraction, so this knowledge is very simple, and you will know it when you go to junior high school.

The flattened ping ball is restored in hot water, using thermal expansion and contraction.

The principle of the benefit, that is, to save the ball, to say the harm, that is, after all, the ball has been injured, the life will be shorter, if you have to say the harm, that is, when heated, the ball will release gas, that is, smelly, this gas is harmful to the human body, but controllable, far away, <>

Or blanch it in a ventilated place.

This is the principle of thermal expansion and cold contraction, there is no good or bad, it is a normal physical phenomenon.

Introduction: Some people say that if you learn physics well, you will not be afraid to go all over the world. There are indeed many places in life that can be solved well if you use some knowledge of physics.

If a ping-pong ball is flattened, it can be restored to its original state by scalding it with hot water. Many people are also curious, what is the principle of this? Let's take a look.

I believe that many people will learn the principle of thermal expansion and cold contraction when they study physics in middle school. Although some people's science grades are indeed not very good, they can still master these simple physics knowledge, and there are many aspects in life that can reflect this principle. For example, when a table tennis ball is stepped on, it can be restored to its original state by putting it in hot water, which mainly adopts the principle of thermal expansion and cold contraction.

Table tennis balls are also gelatinous, the texture is relatively soft, and there is also a certain plasticity, which can have the ability to restore the original shape after deformation. Therefore, the ping pong ball was flattened, and it can be restored to its original state by scalding it directly in hot water. <>

The table tennis ball is made of plastic, and if it happens to be cold in the middle of the day, the temperature of the whole ball will become higher, and the temperature of the gas inside the ball will also rise accordingly, which will make the volume expand, and the concave part will be pushed out by the hot gas of the ball. Even if the table tennis ball is stepped on a little flat, and the air in it becomes very small, the heat of the hot water will be transferred to the ball through heat transfer, so that the gas volume of the ball will increase, and the ball will return to its original state as soon as the volume expands. <>

For example, two water pipes are the same, but if you want to connect one water pipe to another water pipe, then you need to bake it with fire, and then use force to connect the two water pipes together. The production of table tennis also uses the principle of thermal expansion and cold contraction.

A flattened table tennis ball with hot water will turn back because the table tennis ball itself is made of rubber, which is a kind of elastic material. When the table tennis ball is soaked in hot water, the rubber will become soft, lose its elasticity, and the table tennis ball will be deformed. When the ping pong ball cools down, it will change back to its original shape because it will regain its elasticity, which is why the table tennis ball will change back when it is flattened with hot water.

There is gas in the table tennis ball, and when it is put into hot water, the gas is heated and expanded, and the flattened table tennis ball is puffed up.