If molecules are moving, why don't we see things change? Detailed answer

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If molecules are moving, why don't we see things change? Detailed answer

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If molecules are moving, why don't we see things change?

If molecules are constantly moving at frightening speeds and this happens everywhere - even in a piece of wood - then why don't we see things change shape? A molecule is the smallest of the existing particles of a substance that retains the properties of the whole. For example, a sugar molecule (sucrose) is the smallest particle of sugar, which nevertheless retains such properties of sugar as taste, color, shape, solubility, and others.

Molecules of different substances are very different from each other. Some of them are only a few billionths of a millimeter long, while others are thousands of times longer. The gas molecules that make up air are so small that there are 30 molecules in one cubic centimeter of air! But even though there are so many molecules in a substance, there is a lot of unused space between them. Since molecules are always in motion, they move in absolute vacuum. Between air molecules there is no air, there is only vacuum, and between iron molecules there is no air, only vacuum.

The movement of molecules is caused by heat. The higher the temperature, the more intense the movement. In hot gases, this movement is very intense. In a liquid or in a solid it is much slower, but there is movement even in a piece of ice! If the molecules in matter are constantly colliding with each other and pushing each other in different directions in all directions, then why do we not see the results of this movement? Why, for example, do we not see a piece of iron change because of this movement? Why does he seem so hard? The reason for this is that in solids or liquids, molecules are held in place by attractive forces between molecules. Otherwise, the substance would be torn apart.

The forces of electricity holding molecules together are strong enough to keep even the hardest materials in an unchanged state. But if a substance is heated very strongly, then the movement of molecules will accelerate, and this substance will become a liquid. If you increase the temperature even more, then the molecules will be able to overcome the forces of electricity, scatter in different directions, and the substance will pass into a gaseous state!

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Where did the kissing habit come from?

We believe that a kiss is a form of admiration. But long before that, in many parts of the world, a kiss was an expression of respect.

In many African tribes, the natives kiss the ground where their leader has walked. In ancient times, kissing the hand and foot was an expression of respect and reverence. The ancient Romans, kissing on the eyes and on the lips, thus expressed respect at the meeting. One Roman emperor allowed the most noble people to kiss his lips, the less noble allowed him to kiss his hand, the people of the lowest rank were content to kiss his foot!

It is possible that kissing as a form of admiration has its origins in the distant past, when mothers caressed their children in the same way that they do today. And society had no choice but to accept this in the form of an expression of good relations between adults.

We have information that such a tradition already existed in the XNUMXth century, but we can only assume that it is even older. The first country where kissing was accepted as a form of love and courtship was France. When dancing became popular, every dance number ended with a kiss.

From France, this tradition quickly spread throughout Europe. Russia, which adopted many of the traditions of France, also adopted this tradition, and the exchange of kisses spread among noble people. The royal kiss has become one of the types of rewards from the sovereign.

Over time, the exchange of kisses became part of the courtship. With the development of wedding ceremonies, the kiss became part of the wedding celebration. Today, undoubtedly, the exchange of kisses is an expression of love and courtship. However, in many parts of the world it remains part of official ceremonies, a form of respect and admiration.

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