In the bright moon of the Qin period, Meng Tian used the principle of thermal expansion and cold contraction to destroy the enemy's city walls, so as to achieve a small victory in the siege battle.

It can be seen that science has power. There are unpopular in all disciplines, and physics is no exception.

Thermal expansion and contraction are the other one. Although I have known it since I was in school, I don't seem to know anything except a name.

I can't help but ask, is it really not worth analyzing and thinking about at all? The famous philosopher Sartre said that man's greatest freedom is that he cannot get rid of freedom.

Maybe it's not that it's worthless, it's just that you don't want to suffer the consequences of accepting it. Since it is thermal expansion and cold contraction, it can't get around.

However, just like cloning, thermal expansion and cold contraction also touch the bottom line of ethics. In the summer, the weather is hot.

Winter time, the weather is cold. In this way, people seem to be engaged in thermal expansion and contraction. However, I have lived for almost thirty years and have never felt it.

So, does thermal expansion and contraction happen to me? I think there is. But why didn't I feel it?

Probably because it's too small for me to feel. In fact, the reason for the occurrence of thermal expansion and contraction is that the temperature difference is large.

And the temperature difference is the cause of heat transfer. Therefore, thermal expansion and contraction are actually caused by heat transfer.

So, what do you have to say? Mizukawa said that he didn't forget to look at everyone, and the opening was indeed a bit long. There are questions to be answered.

My question: Is the expansion an increase in the distance between molecules or between atoms? First of all, thermal expansion and contraction are physical changes, not chemical changes.

Since the chemical reactions involving atoms are chemical changes, it is not possible. In addition, some molecules have only one atom, so thermal expansion and contraction will increase the distance between atoms.

That said, it allows for a very small increase in the distance between atoms. It may be buffered by the chemical bonds between the atoms, resulting in no change in the distance between the atoms.

Dueñas's narrative is simple, but the situation is not simple at all. We discuss how we can have fewer questions, and my question is whether the inflation is simultaneous or a little divergent?

Anyone who has seen the bright moon of the Qin period knows that the city wall began to crack in many different areas. Since the soldier does not splash water and oil at the same time, the thermal expansion and cold contraction are naturally not at the same time.

If it can be done, it should happen at the same time. However, with the current level of human technology, it is not possible to do it at the same time.

Therefore, there must be several key starting points. Divergence from them, and it happens. Liuzi Fenglai didn't say a superfluous word, and quickly explained the situation of the matter.

My question is why does water turn to ice, so why does it increase in volume? Doesn't it say that heat expands and contracts cold, how can water violate this law?

If it's because of fluids, what about vegetable oils? We know that hydrogen atoms and oxygen atoms are joined together by hydrogen bonding.

Although when the water turns into ice, the hydrogen bonds in the water molecules are not broken. However, the loss of heat leads to the weakening of hydrogen bonds.

Because of this, the distance between the atoms increases. Therefore, the volume of ice increases by a certain percentage relative to water.

Then there's the evaporation of water molecules. Because the water turns into ice, some of the water molecules that were supposed to evaporate turn into ice.

It can be seen that there is a complex cause behind any phenomenon. Margarita comes out at the end.

As the finale, what he said was really extraordinary.