Why can the table tennis ball be scalded with boiling water to restore it?

In fact, this is the principle of physics, thermal expansion and contraction, when he encounters boiling water, the gas in it will become hot, and after the heat is hot, the table tennis ball will rise.

Yes, this can be explained with junior high school physics knowledge, but sometimes it is not necessarily very useful. When I was a child, celluloid balls were okay, but with creases, playing still had an impact. Now that plastic is used, fewer people are doing it.

However, the ball became brittle, cracked a lot, and there were very few deflated steps.

It can be said that it is thermal expansion and cold contraction, the air inside the table tennis ball is heated by the temperature increases, the volume expands, and the pressure on the inner wall increases, when the pressure is large enough, the table tennis ball can be restored to its original state.

When air is heated, the velocity of the air molecules increases, which makes the volume of the air increase with increasing temperature. When a table tennis ball is placed in hot water, the air in the table tennis ball is heated, resulting in an increase in the volume of air inside the ball; In this process, the number of molecules in the air in the sphere does not increase, but the distance between the molecules is increased, so that the volume occupied by the air also increases. In this way, the deflated ping pong ball gradually recovers.

The table tennis ball will be deflated by external force, but in most cases, the outer surface of the table tennis ball is still intact, at this time, as long as we put it in hot water, it will puff up again, this is because the air inside is heated and expands to push up the outer surface of the table tennis ball! (If the outer surface is damaged, it can no longer bulge). However, it should be noted that it should not be put in hot water for too long, otherwise it will deform the table tennis ball.

Hot expansion and cold contraction, my brother in the first year of junior high school knows it. After the gas in the table tennis ball that is deflated by the foot is squeezed, the volume of the gas decreases and the density increases. When it is put into hot water, the heat of the hot water is transmitted to the gas in the ball through the table tennis ball, and the temperature increases rapidly after the gas absorbs the heat, and the gap between the gas molecules increases rapidly, and the volume increases, so that the depression part is pushed out.

To put it simply, it is thermal expansion and cold contraction, because the air expansion coefficient in the table tennis ball is greater than the table tennis ball itself, that is to say, the volume of air in the ball expands more than the skin of the table tennis ball with the same temperature difference, and the table tennis ball is "blown". As soon as the hot water is hot, the air inside expands and the ball softens a little, so the ball returns to its original shape, but first the table tennis ball must be air-tight.

Because the air has the nature of thermal expansion and contraction, as long as there is no air leakage when the deflated table tennis ball is stepped on, when it is put into hot water, the air inside is heated by the temperature rises, the volume expands, and the pressure on the inner wall increases, and when the pressure is large enough, it can restore the table tennis ball to its original state.

Thermal expansion and contraction, the gas in the table tennis ball will expand when heated, and the material of the table tennis ball itself will become soft when heated, which is more conducive to its original form.

Since the table tennis ball is a plastic product, not an iron tool, it has a certain ability to restore its original shape, and according to the principle of thermal expansion and cold contraction, soaking in hot water can make it expand. In addition, I would like to say that when making table tennis balls, this principle was also used, and through similar operations, table tennis balls were produced one by one.

Very simple. The gas in the table tennis ball is heated and expands, which produces a lot of pressure, which produces a lot of pressure, and the ball will become softer, and the ball will naturally return to its original state. However, after this scalding, the table tennis ball will be slightly deformed, and it is a little inaccurate to say that it is "restored", and it can only be said that the shape is close to the previous state, which is difficult for the naked eye to detect.

When the table tennis ball is put into hot water, the air inside the table tennis ball will be heated and expanded, and the volume will become larger, and in the closed container, the internal pressure will increase, and the pressure will be generated from the inside to the outside. And because the table tennis ball itself will become soft when heated, as a result of the double effect, the deflated table tennis ball will bulge up again and will return to its original appearance.

Anyone who has studied physical chemistry should know it. This is the principle of using thermal expansion and cold contraction.

For three minutes a day, take the baby to play as a scientist.

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 table tennis ball.

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 encounters cold water, it will make the temperature of the whole ball higher, and the temperature of the gas inside the ball will also increase 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. <>

The principle of thermal expansion and cold contraction is also very common in life, for example, two water pipes are the same, but if you want to connect one water pipe to the other water pipe, then you need to use fire to heat it, and then force the two water pipes together. The production of table tennis also uses the principle of thermal expansion and cold contraction.

The principle of thermal expansion and cold contraction. Because when the balloon is flattened, the air inside is also very thin. Then when hot water is used, the internal cold and external heat will form a pressure difference. So as soon as the water is hot, it returns to its original state.

When a ping pong ball is placed in hot water, the air in the ping pong ball is heated, resulting in an increase in the volume of air inside the ball. In this process, the number of molecules in the air does not increase, and the distance between the molecules is increased, so that the volume occupied by the air also increases. In this way, the deflated ping pong ball gradually recovers.

Because there is air inside the table tennis ball, if the table tennis ball is scalded with boiling water, the air inside will expand when heated, and the surface of the table tennis ball will become softer when heated, so it will return to its original appearance.

This is mainly due to the principle of thermal expansion and cold contraction. When the hot water scalds the table tennis ball, the air inside the table tennis ball expands, so the deflated part is pushed up.

This is the principle of thermal expansion and contraction, because the material of the table tennis ball can produce a reaction of thermal expansion and contraction after encountering hot water, so it can be restored to its original state when scalded with hot water.

Because of the principle of thermal expansion and cold contraction, it is because the hot air in the table tennis ball will expand and expand after preheating, and the table tennis ball will become round after that.

This is the principle of thermal expansion and cold contraction, and the gas will be transferred through the outside of the ping-pong ball, which will push up the depression and can expand the volume.

Because the gas of the table tennis ball is compressed, it will expand once it is heated.

If you put it in hot water at this time, using the principle of thermal expansion and contraction, the gas will quickly become larger after absorbing heat, and the table tennis ball will return to its original state.

Using the theory of molecular motion, when the temperature drops, the vibration amplitude of the ions decreases, and the object shrinks, and when the temperature rises, the vibration of the particles becomes larger, and the object expands.

Because there is air inside the table tennis ball, if the table tennis ball is scalded with boiling water, the air inside will expand by heating, and the surface of the table tennis ball will become softer when heated, so it will return to its original appearance.

This is the manifestation of the physical changes of cold shrinkage and heat expansion.

The temperature is high, and the air inside the ball expands.

When the table tennis ball is still round, there is air and air pressure in it, but the air pressure in the ball will be greater after he is deflated, and it will not be rounded.

However, this trick can't be done too much, and it will definitely not be able to drum up if it is too deflated.

Heat expansion and cold contraction The air inside the ball is heated and expands, and the deflated place is propped up.

This is the principle of thermal expansion and cold contraction. When the table tennis ball is deflated but not broken, when it is scalded with hot water at a moderate temperature, the air inside the table tennis ball is heated and expands, and the pressure increases, which will turn the table tennis ball"Brace"Get up. If you think it's wrong, I guess the table tennis ball is burned, and I'm afraid that you will burn it again, so I quickly puff up!

Ha ha.

Because there is air in the table tennis ball, the air inside is heated and expanded, and the place where it is held down is lifted! It's not the hot expansion and contraction of the table tennis ball itself, but the air inside.

When the air molecules are heated, the kinetic energy increases, the diffusion motion rises significantly, and the collision with the ball wall is very intense, which creates a certain tension and returns the ball to its original state.

The gas expands when heated, PV=NRT. The volume does not change, and the amount of gas does not change. r is a constant. As the temperature t increases, the gas pressure increases. Relying on the pressure inside the table tennis ball, it is the table tennis ball that expands outward.