That such diffusion in physics: definition and interesting examples

In secondary school every seventh-grader in physics necessarily acquainted with the various phenomena that can be found in everyday life and in industrial conditions.

This article focuses on diffusion. The term may sound intimidating, unusual. In fact, it is one of the most frequent phenomena, or rather even say that it is always and everywhere takes place. Let us look at what is diffusion in physics, at the same time give many examples which will make it clear: there is nothing difficult, and the subject in the school subject quite easy and interesting.

Definition of diffusion

In different sources can meet different formula, but one that does not lose its original meaning.

Diffusion-a phenomenon in which molecules of one substance penetrates into the molecules of another substance. The student may seem this phrase is too unclear and complicated. But really, everything is quite easy. As is known, the molecule-the smallest particle of any substance (it is even in air, gas). Each molecule are connected by structural links. The denser the structure, the harder body. Thus, the penetration of molecules of one substance into other molecules will be in the case where the structure of the most simple or molecules exist freely.

That's why it sounds definition. What is diffusion in physics? In other words: the connection, the penetration of the two substances in each other. Eventually formed a single unit.

Gas and air

Let's start with the examples about simple molecular compounds as gases. The fact that the air is the easiest to change. For example, you sprayed perfume in the room. Instantly or after a few seconds, already felt the smell. In this case, we can answer the question of what is diffusion.

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In physics, all substances are divided into three main States:

• Gas;
• Liquid;
• Solid.

Accordingly, the gaseous state capable of sufficiently rapid response.

Here is another example: the smell of paint that spreads around during the painting products. Car exhaust gases are also diffusion in the environment, so, unfortunately, suffers from the environment, polluted air in big and small cities.

It is Worth noting that the air mobile, its molecules are constantly moving. So the diffusion of any foreign gaseous substances takes place constantly.

Water

Now consider briefly, what is diffusion in physics in respect of liquid substances. Imagine a container of water. It will add a bit of potassium permanganate or of a dye stuff. The process can be observed as long as the water is not stained. It should be noted that the diffusion occurs much faster in hot water. It can show an ordinary Cup of tea or coffee. If in hot water add sugar, it dissolves quickly. Adding cream to hot coffee too, there is a rapid fusion of coffee and water and cream.

When cooking soups, broths and sauces too, there is diffusion. It should be noted that thermal processing of food (specifically cooking) happens most often precisely because it is necessary to connect one substance with another. For example, the chicken broth will not work in cold water, because the meat juice needs to interact with hot water.

Solid products in the industry

There is such a condition of the substance when it is impossible to determine it is solid or liquid. I do not mean the pure substance, and the totality. For example, the batter for pancakes, liquid clay, thick oil. What is diffusion in physics in relation to such products? The penetration of molecules will also remain. For example, in the manufacture of alloys, plastics are applied in liquid state the various materials which are by their nature rigid. But when heated, they become liquid, their molecules are able to penetrate one another, then there will be diffusion. Thus, there is a lot of sturdy steel, plastic products and materials.

Diffusion in solids

Previously we examined the definition, what is diffusion in physics, know now. According to the logic, in solids diffusion can not be. This is partly true. But there are indications that at constant storage together of certain substances, they become one.

For Example, if together in one box lead and gold so that they were tightly pressed against each other, after about 5 years they will be joined by their surfaces. Therefore, answering the question on what is diffusion in physics, we will consider absolutely all substances, but only one state.

Chemical processes

In conclusion it should be noted that the diffusion phenomenon is studied in chemistry and even in biology. Therefore, this term may be encountered not only in physics. Chemists in the laboratories are constantly carrying out different experiments in which no such process is necessary. But the main theme is considered in 7th grade. What is diffusion in physics and chemistry? It is a frequent phenomenon in nature and in life, as well as in the production ofanything.