How does foam come about? How does a bubble come about, and why does it exist?

The formation of foam is very simple, as long as a gas is introduced into the solution of foaming agents (surfactants or polymer compounds), foam is formed on the surface of the solution. After the foam is formed, the liquid entrained between the walls of the bubbles is lost downward under the action of gravity, the liquid film gradually becomes thinner, and the bubbles are close to each other and deformed. Figure 1 shows the deformation of three bubbles as they approach each other, and the junction of the three bubbles is called the Prato junction.

According to the Laplace equation, the pressure at A is greater than that at B, and the liquid in the membrane flows towards the Prato junction and the liquid membrane becomes thinner further. During this process, if the liquid film is not strong enough, the liquid film will rupture and the foam will gradually disappear. If the foaming agent can be adsorbed at the gas-liquid interface to form a tight monolayer, after the liquid film is thinned to a certain thickness, the two monolayers meet in the liquid phase and undergo spatial obstruction, or the two diffusion electric double layers overlap and electrically repel, both of which can prevent the liquid film from becoming further thinned.

When the liquid film reaches equilibrium at a certain thickness, the foam can be temporarily stabilized. Therefore, the greater the spatial hindrance caused by the adsorption monolayer and the repulsion effect of the electric double layer when it is approaching, the more stable the foam is.

Foam is caused by the action of surfactants.

It's because of the bubbles that are produced in the water.

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Problem description: When cleaning items with cleaning products, foam is generated, how is foam produced, and why is foam generated? And when water falls from a high place into the water, there will also be foam, why?

Analysis: Foam is caused by the action of surfactants.

Active Ingredient The active ingredient is the ingredient that plays a major role in detergents. The active ingredient is a class of substances called surfactants, which weakens the adhesion between the stain and the laundry, and causes the stain to be removed from the laundry under the action of mechanical forces such as the flow of washing water and the agitation of the hand rubbing or washing machine, so as to achieve the purpose of washing the laundry.

Note: 1. In order to achieve a good decontamination effect, the laundry detergent should contain enough active ingredients. In order to ensure the washing effect of laundry detergents, the competent national authorities have set a minimum level of active ingredients in laundry detergents.

Depending on the type of active agent used and the type of product, the amount of active ingredients in laundry detergent should generally not be less than 13%;

As house prices rise, investors are pleased with their CDOs, especially those that are very risky and highly yielding. Correspondingly, with the creation of the housing bubble, "credit expanded dramatically, and not only did people use credit more freely than usual, but they actually had more credit because they seemed to be making huge gains." Under such a cyclical mechanism, the bubble swells larger and larger, and the illusion of prosperity it creates makes rash and adventurous sentiment popular.

In the midst of the prosperity, people's risk-taking mood was aroused, and they wanted to buy more collateralized debt bonds. Wall Street bankers, encouraged by the early success, turned to mortgage companies again to buy more mortgages; Mortgage companies then approached brokers and asked them to provide more homeowners. But the agent can't find anyone to buy a house for a while, because those who are eligible to apply for a mortgage already have a house.

But they still have a way, and in this environment, people are willing to give or obtain credit more than at any other time, and eventually even those who are not eligible for credit at all are willing to give credit to them. That's when the people who were later seen as black sheep related to subprime mortgages began to come into the picture.

1. Foam, also known as porous plastic, is a plastic made of resin as the main raw material with countless micropores inside. Light weight, heat insulation, sound absorption, shockproof, corrosion resistance, soft and hard.

2. It is widely used as heat insulation, sound insulation, packaging materials and vehicle and ship shells.

3. Foam plastic is a polymer material with plastic as the basic component and containing a large number of bubbles, so it can also be said to be a composite plastic with gas as the filler. Compared with pure plastics, it has many excellent properties, such as light weight, high specific strength, ability to absorb impact loads, good heat and sound insulation performance, etc.

For example, the big wolf and the Yan group are both selling baked cakes, one day, they began to buy each other's baked cakes, buying and buying to raise the ** from 1 to 50, people in the market saw that the price of the baked cakes kept rising, so they joined in a swarm, resulting in the crazy rise of the baked cakes, a baked cake worth only 1 yuan, sold alive to hundreds of yuan, and some people believe that it will go to **, this is the bubble economy.