Small questions about the physics of water boiling, what is the phenomenon in water when water boils

Please, please take a look at the question.

People ask about the bubbles that come out of the water when it boils.

No, the air dissolved in the water at that time.

Because the solubility of the water is heated to the bottom, the air that was originally dissolved in the water escapes.

Dizzy. What are you talking about upstairs?

Please pay attention to the questions.

When boiling, the water evaporates violently.

To know. When water turns into steam, its volume expands a thousandfold.

So. It's normal for a small drop of water to turn into a bubble.

Upstairs is supposed to be the fog above the boiling water.

That's when the evaporated water vapor from the boiling water meets the cooler air.

It turned into small droplets of water again, and this is the fog.

No, water vapor is invisible.

It is a small droplet formed by the liquefaction of water vapor when it is cold, suspended in the air.

It's not liquefaction! The water droplets formed by the liquefaction of water vapor in the air are the bubbles that bubble up.

Oh oh I came first, man

No. It is liquefaction.

Water boils into small water vapor, at which point the water vapor in the air liquefies into small water droplets when it encounters hot water vapor, which is what we see as bubbles.

There is also water vapor which is a gas and is invisible.

Please, I've just finished my studies, so I don't even know this.

I think so, you see that water is liquid, at 100 degrees Celsius, it is vaporized, and it becomes water vapor (not foggy water vapor is gas, invisible, what can be seen is small water droplets, pay attention to distinguish), all of a sudden the volume becomes very large, it will bubble, it should be like this.

No. Water first vaporizes into water vapor.

The water vapor then liquefies into visible blisters, i.e. small water droplets.

I think it is, water vaporizes at high temperatures and becomes water vapor, and the gas is less dense, so bubbles are formed.

Find Ben"100,000 whys"See, there may be an answer there.

When the water below is boiled, the pressure is relatively large, and the gas comes out, and the higher it goes, the lower the pressure, and the last one that comes out looks very large. From the bottom to the top, the cheongsam will get bigger and bigger. Physics just learned, hehe.

The boiling of water is a violent vaporization phenomenon; At this time, a large number of bubbles rise, become larger, and burst to the surface of the water, insideWater vaporemitted into the air. During the boiling process, although the water is continuously heated, it can only make the water constantly turn into water vapor, and its temperature remains the same.

Conditions for water boiling:

For a liquid to boil, two conditions must be met at the same time:

First, the temperature should reach the boiling point of the liquid.

Second, it needs to be heated constantly. The boiling point of different liquids is different, and the boiling point of water is at 1 standard atmosphere.

The next is 100; When water reaches its boiling point, it cannot boil if it cannot continue to absorb heat.

Details:The bubbles before boiling, the more they reach the liquid, the smaller they become. The reason is that when the liquid is heated, the temperature of the upper layer of the liquid is lower than that of the lower layer, and the solubility of the upper layer of the liquid is stronger than that of the lower layer.

In the bubble, some of the gases that cannot be dissolved in the liquid in the lower layer float to the lower temperature of the upper layer, and dissolve in the liquid again, making the bubble smaller. Most of the bubbles produced before boiling have become smaller and disappear before reaching the surface of the liquid.

The bubble during boiling is the vapor after the liquid has vaporized, and this bubble becomes larger the higher it reaches the upper layer of the liquid. This is because the bubbles in the lower layer are mixed with other bubbles as they float up, making the bubbles bigger and bigger. The bubbles produced during boiling will burst when they reach the surface of the liquid.

After rupture, it forms water vapor with the surrounding boiling water, and after leaving, it is cooled and liquefied into small water droplets, which is the "white gas" we see.

The above content reference: Encyclopedia - boiling.

When the water boils, the bubbles get smaller and smaller, because the temperature of the water vapor in the bubbles is higher than the temperature of the water, so the water vapor continues to liquefy, so the bubbles become smaller and may disappear.

When the water is boiling, the bubbles continue to vaporize during the rising process (because boiling is a violent vaporization phenomenon that occurs both inside and on the surface of the water), and the water vapor in the bubbles increases, coupled with the decrease in depth and pressure when rising, so the bubbles are getting larger and larger.

The phenomena when water boils are as follows:

1. The boiling of water is a violent vaporization phenomenon, and the boiling will produce a large number of bubbles, and the bubbles will rise slowly;

2. The bubble rises slowly, and with the change of time, the bubble will gradually become larger until it bursts on the water surface;

3. The bubble before boiling is smaller the more it reaches the top of the liquid, because when the liquid is heated, the temperature of the upper layer of the liquid is lower than that of the lower layer, and the solubility of the upper layer of the liquid is stronger than that of the lower layer;

4. When the bubble bursts, the water vapor inside is emitted into the air and becomes gaseous water molecules in the air;

5. In the boiling process, although the water is continuously heated, it can only make the water continuously turn into water vapor, and its temperature remains the same.

The phenomena when water boils are as follows:

1. The boiling of the water is a violent vaporization phenomenon, and the boiling will produce a large number of bubbles, and the bubbles will rise slowly;

2. The bubble rises slowly, and with the change of time, the bubble will gradually become larger until it bursts on the water surface;

3. The bubble before boiling is smaller the more it reaches the top of the liquid, because when the liquid is heated, the temperature of the upper layer of the liquid is lower than that of the lower layer, and the solubility of the upper layer of the liquid is stronger than that of the lower layer;

4. When the bubble bursts, the water vapor in it is emitted into the air and becomes gaseous water molecules in the air;

5. In the boiling process, although the water is continuously heated, it can only make the water continuously turn into water vapor, and its temperature is kept unchanged.

1. When the overall temperature of water (liquid) reaches Laodan Cave to its boiling point, and continues to be heated, the liquid can be vaporized at the same time due to heat absorption, that is, at this time, not only the liquid surface liquid is transformed into a gaseous state, but also the gaseous bubbles escape from the liquid inside, which is "boiling";

2. The bottom of the water tube is heated by the observation of the late rent, the bottom water reaches the boiling point first due to its proximity to the heat source, and the bubbles rise in the water after the bottom water vaporizes, but the water temperature of the upper layer has not yet reached the boiling point, and the water vapor in the bubbles in the rising process re-condenses into water due to the decrease in temperature, and the volume of the bubbles decreases; When the water temperature in the test tube reaches the boiling point, the rising bubbles increase in volume due to the continuous addition of vaporized water vapor, the bubbles become larger, and the water is opened;

3. When the inside of the liquid is heated to the boiling point, and the vaporized bubbles inside the liquid continue to increase in volume during the rise of the liquid inside, it is called "boiling".

Water boiling is when water is heated beyond its saturation temperature. Water has a boiling point of 100 at a standard atmospheric pressure, which is the most common. At a certain external pressure, boiling can only be carried out at a certain temperature (boiling point) and continuous heating.

When the liquid is boiling, the temperature remains the same and it still absorbs heat.

Boiling point of water:

When the kettle is boiling, some small bubbles will appear on the wall or bottom of the kettle, and the small bubbles will vaporize with the surrounding liquid, and the boiling phenomenon will occur with it as the center. The boiling point of water in convective heat transfer is 100, but if it is heated in the microwave, the temperature will be much greater than 100 without the water evaporating.

Due to the lack of the second condition for boiling in the water heated by the microwave oven, the gasification nucleus, the superheated liquid that easily reaches or even exceeds the boiling point but does not boil, when small particles (coffee powder, etc.) are put into the superheated liquid at this time, they (small particles such as coffee powder) induce the production of gasification nuclei, forming the phenomenon of instantaneous explosion between large liquids.

Experts remind that the water heated in the microwave oven should not be stirred or shaken as much as possible, because while we stir and shake, we are actually suddenly changing the environment of the water, and the water in the cup may instantly boil. In addition, it is recommended that you use the liquid heated in the microwave oven to leave the liquid for a while before using the plum to avoid unnecessary harm to everyone.