Why does boiled water bubble?

For some very attentive children, they are able to discover some strange phenomena in life at a young age. Then these strange phenomena, we can also use some science to inform them. So there are some children who will ask their parents when they are young, why they will bubble when the water is boiled, so today we are going to talk about this question.

Water reaches the boiling point first of all with a lot of people in their subconscious.

They will feel that the boiling water itself will bubble, so they will not think about why. In fact, when water is boiling, they produce bubbles, and these bubbles are mainly due to the violent vaporization of water, which increases the area of these organs. And the bubbles themselves only occupy a small part of the larger area, so they boil at the same time, that is, when the water reaches its boiling point, there will be a violent vaporization of their interior.

Then from some microscopic points of view it can also be seen that the liquid enters the inside of the water, due to someWater moleculesWith some energy, it will gradually vaporize.

The intermolecular forces then they can break free from the intermolecular forces between the water molecules, and at the same time make the spacing of some of the water molecules larger. In this case, water vapor can be formed.

And once I formed such a phenomenon, there would be an interface between companies. And this temperature is at the boiling point, so some of the water molecules at this interface can become gaseous.

The bubbles go up, so some people will find that when boiling water, their bubbles change from small to large, which means that when the bubble is big enough, they can get rid of an adhesion. Then they rise, and in the process of rising, they continue to get bigger, and you can see that when the water is boiled, some large bubbles appear on the surface of the water, and the circle of this bubble is also the surface tension.

Function. So when the water is boiling, we can see some bubbles on the liquid surface.

It is bubbling caused by the action of heat and air, and boiling water is very hot, so you should never drink it directly.

Because the boiling water is very hot, and there is a fire burning underneath, it will cause the water to bubble.

When the water is boiled, a certain amount of gas will be produced in the water, which will bubble, which is also a very normal situation.

Because when the water is boiled to 100, it will boil and bubble, which is very normal.

If you boil the water again, some bubbles will float upwards because of the heat, because the heating will produce a certain amount of gas.

The white precipitate or foam is made up of a precipitate of calcium and magnesium ions in the water.

Solution: 1. The easiest way is to filter out the sediment or foam in the boiling water, but it is more troublesome.

2. Use a water softener.

3. There are two main methods of water softening:

The first is the chemical softening method, which is to add some agents to the water, so as to convert the calcium and magnesium ions in the water into insoluble compounds and precipitate them. For example, it is softened with lime, but to control the pH value, it is best to be between 9-10.

Second, adding some vinegar to the water can also achieve the softening effect, which is to turn calcium into calcium acetate and dissolve it in water.

The water in the pot is bubbling does not necessarily mean that it is boiling, if it is only the bottom layer that begins to bubble small bubbles, it means that the top has not been completely boiled, and it must wait until a large number of small bubbles rise from the bottom of the pot and gather into large bubbles, which is called really boiling, and after the water is boiled, it must wait for it to boil for 2 minutes to kill the bacteria and microorganisms inside before drinking.

When water is heated to 100 at an atmospheric pressure on the surface of the earth, it reaches a boiling point where it can boil, and violent vaporization occurs. It is manifested in the fact that there will be a large number of bubbles inside and on the surface of the water, and these bubbles will continue to gush upward, and the process of gushing out will be small and large, which leads to the continuous tumbling and surging of water, this phenomenon is the boiling of water.

The boiling point of water is not fixed at 100, this is because water boils at 100 at one atmosphere. If it is less than one atmosphere, then its boiling point will be reduced, for example, if you boil water on the Qinghai-Tibet Plateau, then the water brother will boil at about 90 degrees, this is because the altitude on the Qinghai-Tibet Plateau is too high, resulting in the atmospheric pressure is not as large as the atmospheric pressure at sea level, so the boiling point of water is reduced.

A small amount of air is dissolved in the water, and air is also adsorbed in the small cavities on the surface of the container wall, and these small bubbles act as vaporizing nuclei.

The solubility of water to air and the adsorption capacity of the wall to air decrease with the increase of temperature, and when the water is heated, bubbles are first formed on the wall of the heating surface.

After the bubble is generated, because the water continues to be heated, a superheated water layer is formed near the heating surface, and it will continue to evaporate water vapor into the small bubble, so that the pressure in the bubble (the sum of air pressure and vapor pressure) continues to increase, as a result, the volume of the bubble continues to expand, and the buoyancy of the bubble also increases, when the buoyancy of the bubble is greater than the adhesion between the bubble and the wall, the bubble leaves the wall and begins to float.

Precautions for drinking water:

1. Do not drink raw water.

Raw water contains bacteria, viruses, and parasites that are harmful to humans. Drinking raw water can easily cause acute gastroenteritis, viral hepatitis, typhoid, dysentery and parasitic infections. In particular, large and small rivers, reservoirs, and wells are polluted by factory waste liquid, domestic wastewater and pesticides to varying degrees, and drinking raw water is more likely to cause diseases.

2. Do not drink boiled water.

Some people are accustomed to boiling the remaining warm water in the thermos and drinking it again, in order to save water, coal (gas) and time. But this "savings" are not enough. Because the water is boiled and burned, so that the water evaporates again, the nitrite content will increase, and if you drink this water often, nitrite will accumulate in the body, causing poisoning.

The above content refers to People's Daily Online-Drinking more water in summer has many benefits, and drinking water is healthy, and you should refuse four kinds of water.

The bubbles produced when the water is boiling are basically directly generated in the water that is not next to the wall of the container, and there are no bubbles on the wall of the container. As for the bubbles that are produced before the water boils, it is the exact opposite. Therefore, the bubbles produced when the water is boiling are almost all the phenomenon that the water is directly heated at the bottom of the container and becomes water vapor as soon as it comes out of the water surface.

However, the water is different before boiling, at that time the water and the container have just been heated, and have not yet reached the extent that a large number of water molecules are immediately vaporized, and the bubbles produced at this time are basically the air dissolved in the water, because the air that can be dissolved by the water when heated is reduced, so the air is constantly precipitated out of the water, and the container wall is the place where the heat conduction is the fastest, and it is generally the first place to be heated, so the water is generally the first bubble on the container wall before boiling.

In the same way, in life and industry, many liquids will precipitate solid and gaseous substances due to temperature changes, especially in industry, many solutions precipitate gaseous substances due to temperature changes are toxic, so we should be more careful and detect more at this time.

1: When the water is not boiling, some small bubbles appear at the bottom of the pot, the main ingredient is air. This is due to the fact that the dissolved air in the water is released due to the decrease in the solubility of the gas due to the increase in water temperature. Of course, it also contains some water vapor.

2.When the water boils, a large number of large bubbles come out of the bottom of the pot, which are basically water vapor. It is formed by the vaporization of water after it reaches its boiling point.

When the water is not boiling, the bubbles that come out of the water are mainly caused by the precipitation of the air dissolved in the water due to the increase in temperature and the decrease in solubility. When the water is boiled, it is mainly water vapor.

When boiling water, the bubbles that come out of the water are **? When the water is about to boil, bubbles emerge from the bottom of the pot, which is the air originally attached to the bottom of the pot that is heated and expanded, and rises up due to buoyancy. When the boiling water boils, bubbles emerge from the bottom of the pot, and the water at the bottom of the pot is heated into water vapor, and in the rising process, due to the water pressure becomes smaller, the bubbles burst from small to large when they rise to the water surface, and the bubbles are water vapor.

You can see white gas (water vapor) coming out of the lid.

The water at the bottom of the pot is vaporized by heat.