Ringing water does not boil boiling water does not ring, why does the sound water not boil boiling w

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.

Before boiling, the temperature of each water layer in the window is different, the temperature of the water layer near the heating surface is higher, and the temperature near the water surface is lower. The bubble not only has a pressure p in the air inside the bubble during the ascent process. With the decrease of water temperature and decrease, there is a part of water vapor in the bubble condensed into saturated steam, the pressure is also decreasing, and the external pressure is basically unchanged, at this time, the external pressure of the bubble is stronger than the internal pressure, therefore, the volume of the bubble will shrink in the process of rising, when the water temperature is close to the boiling point, there are a large number of bubbles emerge, rising one after another, and rapidly from large to small, so that the water oscillates violently, generated"Buzz, buzz"This is it"The water does not boil"The truth.

The water continues to be heated, because the convection and bubbles continue to bring heat energy to the middle and upper layers, so that the water temperature of the whole dissolver tends to be consistent, at this time, the bubbles float up the wall of the bubble, the saturated water vapor inside it will not condense, and the saturated vapor pressure tends to a stable value. In the process of bubble floating, the static pressure of the liquid on the bubble decreases with the decrease of the depth of the water, so the external pressure on the bubble wall is gradually decreasing compared with its internal pressure, the mechanical balance on the bubble liquid-gas interface is destroyed, the bubble expands rapidly, accelerates the floating, until the water surface releases steam and air, and the water begins to boil. That's what people often say"The water is boiling"As the bubbles rise to the surface of the water and burst, the oscillations of the water are weakened and are almost inaudible"Buzz"And that's it"Boiling water does not sound"Causes.

There is depth in this question, but you don't need to grasp it, it's beyond the outline.

In the process of water heating, the air attached to the wall and the water forms small bubbles one by one, and the volume of the bubbles increases continuously with the entry of water vapor, but the temperature of the upper part of the water is lower, and a part of the water vapor in the rising bubbles condenses into water to make the bubbles smaller or broken, so that this change of many bubbles causes vibration and sounds, that is, "the water does not open". When the water temperature rises to the boiling point, the upper and lower water temperatures are the same, and during the rise of the bubbles, more water vapor enters the bubbles until the water surface bursts, so there is no sound, that is, "boiling water does not sound".

Hope it helps.

When the water is boiled to about 90 degrees, the water begins to vaporize violently, and a large number of bubbles are formed with the air adsorbed by the kettle wall and the dissolved air in the water as the vaporization center. Sound. When the temperature of the water rises to 100 degrees, the air in the water is basically vaporized, and the bubbles produced are less, and the boiling water is just tumbling, and the sound is quieter.

When the water starts to heat up, the bottom of the kettle creates some small bubbles that are mainly formed by the air adsorbed on the bottom of the kettle and dissolved in the water. In addition to air, the bubble also contains water vapor generated by heating, and as the temperature rises, the water vapor evaporating into the bubble gradually increases, and its volume and pressure will increase, and it rises from the bottom under the action of buoyancy. When the bubble rises to a lower temperature, part of the water vapor in the bubble condenses into water, and the external pressure is stronger than the pressure inside the bubble, and the volume of the bubble gradually decreases.

In the process of continuous heating, the bubbles are generated and expanded more and more, and they are larger and larger, but when the bubbles rise to a lower temperature, the water vapor in the bubbles will condense into water, and the volume will gradually decrease. In such a process, as the temperature rises, the volume of the bubble expands and shrinks for a while, and then rises continuously, resulting in a kind of vibration. If the frequency of this vibration is the same as the natural frequency of the kettle, it will resonate and emit sound.

In addition, there are still bubbles running out of the water, so that the pressure of the gas in the space that does not contain water in the pot increases, and a part of the gas will be squeezed out of the gap between the lid and the body of the pot, and the sound will also be generated. For these two reasons, we hear the sound of water, and the sound of water is getting louder and louder. This sound is made when the water is not yet boiling, and is generally "hum, hum, hum......Voice.

When the temperature of the water reaches the boiling temperature, the inside of the water vaporizes sharply, the water vapor in the bubble reaches saturation, the density atmospheric pressure is high, and its volume not only does not shrink during the ascent process, but also continues to increase. At this time, the buoyancy of the bubble also increases during its rise, and the bubble rises from the bottom to the surface and bursts, releasing water vapor, and the resonance between the bubble and the kettle does not exist, and the sound of water becomes smaller. Then a large amount of gas will be discharged from the gap, the large air pressure will lift the lid of the pot, and after the lid is lifted, a part of the gas will be discharged, and the pressure will be reduced; It falls again under the action of gravity, and the air pressure increases again after the lid is lifted, and so on and so on, so it turns into a "horn, horn, horn...... of water vapor pushing the lid of the potWatt invented the steam engine based on the principle of water vapor pushing the lid of the kettle.

If the water in the kettle is not full, the water surface is below the interface between the spout and the body of the kettle, or the gap between the lid is large, in this case, the water vapor pushing the lid "horn, horn, horn...... will not be heardA large amount of water vapor will come out of the spout or cracks, and the sound is very small or even no sound, which is the physical principle of "boiling water does not make a sound, and the sound water does not boil".

Boiling water needs to be boiled to reach 100 degrees Celsius, boiling water will produce bubbles, and bubbles will burst and there will be sound. If the ambient sound is too loud for you to hear, you can hear it when the environment is quiet.

The above is explained in a physical way.

Sound water does not boil, boiling water does not sound" In fact, there is a meaning in Chinese, describing that there is a reason for the occurrence of certain things, and there is a cause and effect. Where there are causes, there are consequences, and some causes lead to good outcomes and some causes bring not so good outcomes.

The above is my Chinese understanding of this phrase.

Don't know if my explanation helps it?

As the saying goes: "The water does not boil, the boiling water does not sound", this is a phenomenon that everyone feels deeply - before the water is about to boil, there will always be a noticeable sound in the container, and the iron kettle in the past is like a whistle, but after the water boils, it will be much quieter. It's been taken for granted, but do you understand the science behind it?

To understand why "the water does not boil, the boiling water does not sound", we first need to know two simple physics common sense:1The solubility of air in water decreases as the water temperature rises, that is, the higher the water temperature, the less air it can dissolve; 2.

The deeper the water, the greater the pressure, and vice versa. The water that needs to be heated itself contains a certain amount of air, and because the surface of the inner wall of the container is not completely smooth, it also attracts a small amount of air. During the boiling process, the different conditions in which this air turns into bubbles lead to different results of loud or non-loud sounds.

Normally, the boiling point of water is 100 degrees Celsius, and to boil it, it needs to absorb enough heat, and the increase in water temperature is a gradual process. The bottom of the container close to the heat source will undoubtedly be hotter, so when boiling water, many small bubbles will first form on the walls of the container on the heating surface. After the bubbles are generated, the superheated water layer near the heating surface will continuously add water vapor to the small bubbles, resulting in an increase in internal pressure, volume expansion, and buoyancy, and when the buoyancy of the bubbles is greater than the adhesion between them and the container wall, they will begin to float.

Before the water boils, the temperature of the water layer in the container is not the same at different depths, and the temperature of the water layer is higher the closer to the heating surface, and vice versa. In the process of bubble floating, because the water temperature will get lower and lower, and part of the water vapor in the bubble will condense into saturated steam, resulting in a rapid decrease in the pressure inside the bubble, although the external water pressure will also decrease, but in general, the former decreases faster. Therefore, when the external pressure of the bubble is stronger than the pressure inside the bubble, the floating bubble will quickly become smaller and burst before reaching the water.

The closer the water temperature is to the boiling point, the more pronounced this phenomenon becomes. The process of forming, floating, and then shrinking and bursting a large number of bubbles causes the water to oscillate violently and make a sound, forming the phenomenon of "the water does not open".

With the continuous heating of water, as well as the heat transfer of convection and bubbles, the temperature of each water layer in the container tends to be basically stable. In this way, when the bubble floats away from the container wall, the saturated vapor inside it will no longer condense, and the external water pressure is also decreasing, and the overall result is that the pressure outside the bubble will not be greater than the pressure inside the bubble, and finally the bubble can expand and float rapidly until it touches the water surface and releases the air and steam inside. At this time, the water begins to boil and boil, and because the bubbles burst on the surface of the water, the oscillations formed are significantly weakened, and there is a phenomenon of "boiling water does not make a sound".

Based on the above principle, we can deduce that for the same quality of water, if the power of the heat source used for heating is higher, the shorter the time of "ringing water" and the louder the sound. Interested friends may wish to compare the movement and duration of the "ringing water" when the wood stove boils water and the electric kettle boils water, and you can easily verify this small inference.

Boiling is a form of vaporization.

Before the water boils, the temperature of the water near the heat source has reached its boiling point and becomes water.

Vapor upward; At this time, the temperature of the water far away from the heat source is still not the boiling point, and when the small bubbles of water vapor rise from the bottom, they quickly turn back into water droplets, and this process of expanding first and then contracting will cause the water to vibrate and make a loud noise. When all the water reaches the boiling point, the bubbles can rise steadily to the surface of the water, from small to large, until the surface of the water bursts. Since the bubbles do not contract, they only emit a low, faint boiling sound.

It is not that the air in the water is released before boiling, but that the gas in the water has already escaped after boiling, so two different sounds are made. When it is about to boil, the air in the water is the water vapor formed by the vaporization of the water that has reached the boiling point, not the original dissolved air in the water; When boiling, the water is still vaporizing and is still turning into water vapor, and it is more violent than before, because the bubbles no longer contract, so it does not cause the water to vibrate violently and does not make a loud noise.

When water is heated, the density of the water varies due to the uneven heating of the water in the container. The density of the water with a higher temperature at the bottom is higher than that of the water with a lower temperature at the top, so that the water in the container forms an upward and downward convection cycle, which will produce friction, drive the vibration of the water, and drive the resonance of the container, resulting in a louder vibration sound. Secondly, we all know that when the water in the kettle reaches a certain temperature, some small bubbles will appear at the bottom of the container and on the walls of the container, which are formed by the air adsorbed on the walls of the container and dissolved in the water.

In addition to a certain amount of air, there is also saturated water vapor produced by heating in the bubbles. When the temperature continues to rise, the water vapor evaporating into the bubble gradually increases, and the pressure inside the bubble increases, causing the small bubble to gradually expand and rise from the bottom under the action of buoyancy. The temperature of the water above is low, and part of the water vapor in the bubble condenses into water, the internal pressure decreases, and the volume of the bubble gradually decreases.

Continuing to heat, the temperature of the water that was originally lower temperature rises, and the bubbles expand and rise again, and when they rise to a certain temperature, part of the water vapor in the bubbles will condense into water, and the volume will shrink again. Therefore, in the process of heating and boiling water, with the gradual increase of temperature, the volume of bubbles expands for a while, shrinks for a while, and constantly floats and vibrates. When the frequency of this vibration is the same as the frequency of the container (natural frequency), the resonance phenomenon occurs.

That's why we hear the sound of "boom, boom", but the water does not boil, the so-called "boom water does not open". When the water is boiled to the boiling point, due to the convection of the water and the continuous upward movement of hot bubbles, the water temperature of the lower, middle and upper layers of the water tends to be the same, and the water temperature of each part of the kettle reaches 100, it will no longer produce convection circulation, friction and its vibration will gradually become smaller. When the water boils, a large amount of water vapor generated from the bottom of the container continues to gush out of the water surface, and there will be a certain amount of friction between the water vapor and the water in this process, but this friction is not large, and the resonance between the bubbles and the container is relatively small, and only the "hiss" sound can be heard.

There is also a situation where when the water is boiling, it makes a "horn horn" sound. This phenomenon is due to the fact that when the water boils, the pressure inside the bubble is greater than the pressure outside the bubble, and the bubble expands rapidly, accelerating upwards until the water surface bursts to release steam and air. As a large number of bubbles burst, the air pressure increases and hits the kettle lid, causing the kettle lid to be bounced up, releasing part of the gas and falling.

This is the principle of "boiling water does not make a sound".