The truth that the water does not boil and the boiling water does not sound

The water is heated and the water temperature gradually increases. Due to the dissolved air in the water, the bottom and walls of the container.

Many small bubbles appear on it. The bubbles contain air and saturated water vapor. Continuing to heat, the bubbles are heated and expanding, floating in the air.

Under the action of the force, it rises out of the bottom and walls of the container, and at the same time forms new bubbles under it. Due to the capacity.

When the bubbles rise to the upper layer of colder water, a part of the water vapor condenses into water, and the bubbles shrink (or even disappear), leaving only a small amount of air and bubbles gushing out of the liquid surface. water boils before due to.

The volume of the bubbles alternates from large to small, thus making a "whirring" sound, which is often said.

The sound of water does not boil". Continue to heat until the water temperature reaches the boiling point, at which point the bubbles will not rise during the rise.

On the contrary, the water around the bubble continues to vaporize violently into the bubble, causing the bubble to increase in volume until it rises to the liquid level and splits and releases a large amount of water vapor. At this time the container of water.

It begins to churn up and down, forming a boiling phenomenon. At this point, there is no alternating change in the volume expansion and contraction of the bubble, and that is.

There is no more "whirring" sound. That's why "boiling water doesn't make a sound".

When the water reaches a certain temperature, it boils, so there is a sound.

It's similar to "real people don't show their faces, and they don't show real people." ".

The sound of water does not boil, and the boiling water does not sound"".

Or the dog that bites does not bark.

The proverb "If the water does not boil, the boiling water does not sound", it reveals a phenomenon that exists in people's lives: under people's attention or attention, there are often some inconspicuous, slight, seemingly innocuous problems or situations, and if they are not paid attention to or dealt with, they will evolve into more serious incidents or crises, and even bring irreversible consequences.

For example, physical health problems are generally caused by long-term neglect of discomfort or minor illnesses and pains. Or the occurrence of enterprise security incidents is often caused by ignoring routine management measures such as security details and rules and regulations. Therefore, we need to look at and deal with seemingly trivial situations in a timely manner to prevent and avoid bigger problems and hidden dangers that may occur in the future.

In addition, this proverb can also be extended to the main point when people speak, that is, it is not necessary to say too much, but it is not necessary to say it without saying it. When we are communicating, we should focus on the main points and make clear what we want to say, so that the other party can clearly understand our intentions. It is not necessary to say more and not less, but to express our opinions and ideas just right.

Why is it said that "the water does not boil, the boiling water does not sound".

Under normal conditions, 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 the nucleus. 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"The ring, that's it"The water does not boil"".

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 is"Boiling water does not sound"Causes.

Through this natural phenomenon, it is extended to express that people who are really capable or mature people are often quiet, and this kind of person can do things and behave in an orderly manner, on the contrary, those who sneer or immature people all day long, they can't act calmly, and often have no great ability and real ability.

The reason is very simple: in the process of boiling water, when Li Ran water does not boil, it is in the process of gradual heating of cold water, the molecular structure of water is changing, producing a beautiful collision sound, as it continues to heat to become boiling water, the water molecular structure is the same, the sound will be smaller, people can not hear the sound, so there is a saying that "the water is not boiling, the boiling water is not ringing", is it reasonable for me to say?

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".

To put it simply, it is caused by the rapid heating rate of the container or the bottom of the container, and the uneven change in the volume of water vapor bubbles. Due to the rapid heating of the bottom or local heating of the bottom of the container, the bottom of the container or the local water reaches the boiling point first, the water in the upper part of the container does not have time to reach the boiling point, and the steam bubbles produced after the bottom or local water boils upwards in the process of bubbling up, the heat of the fingers and limbs will be quickly absorbed by the cold water that does not reach the boiling point, and the volume is rapidly reduced, which is equivalent to the effect of the bubble bursting immediately, and the vapor bubbles will also directly reach the liquid surface in the form of large bubbles when the container is shallow, and then the water volume changes violently and collides with the container wall. It produces more intermittent impact sounds, so it produces a "ringing water" effect.

When the water gradually reaches the full boiling point, the process of "escape and generation" of the vapor bubble reaches a dynamic equilibrium, and the above-mentioned intermittent impact effect quickly disappears, and the water vapor bubble directly penetrates the water body to the top. On the other hand, when the water is all boiled, the air pressure in the container increases, and the water is evenly covered with dense vapor bubbles, and the propagation speed of the sound decreases, resulting in the effect of sound absorption and sound insulation, and the sound spectrum also changes, and the sound tends to be stable, so it doesn't sound very "loud". Therefore, there is scientific truth in the saying that boiling water does not make a sound, and that the water does not boil.

I think there is scientific truth to this statement, because it is proven by practice.

There is some scientific truth to such a statement, and there is some evidence to prove it, so I agree with this statement.

Yes, this is a normal physical phenomenon, a principle of thermal expansion and cold contraction, so there is a scientific reason.

I have experimented that when the water in the kettle reaches about 90, a large number of bubbles begin to occur in the water, and when the bubbles burst on the surface of the water, they produce a special 'hiss... sound, the water is not yet boiling; By the time the water boiled, the air in the water had run out, and the water was just tumbling but there were not many bubbles, so there was no sound, but the water was boiling.