The process of boiling water is always accompanied by noise. However, in some kettles it is quieter than in others it is louder. This may depend on many factors. Namely: from the type heating element, the material from which the body is made, the shape, the build quality of the device, the thickness of the bottom, the power of the kettle, and possibly some other features of a particular model. It has been noticed that plastic slightly (just a little), but still dampens the sound, but metal does not; a flat heater (not to be confused with a hidden one) is more conducive to quiet operation of the device than a round one, and a powerful device will heat water faster, but at the same time makes more noise than a low-power one. However, it is not a fact that when buying a kettle, even taking into account all these factors, it will turn out to be silent.
There are no completely silent kettles in our stores yet. And advice from those who already use one or another model will help you find a model that is not very noisy. The information shared by home tea drinkers is always true (unlike advertising in a store). After reading the user reviews, I identified the five quietest electric kettles. Here they are:
Braun WK 300(2011)
The model is distinguished not only by quiet operation and a number of other positive characteristics. The device has a power of 2200 W, a plastic case, and a closed spiral. A fairly large volume of water (1.7 liters) boils in just five minutes. Reliable European quality, Beautiful design, comfortable handle. The model is equipped with a multi-stage security system.
The device turns off:
- when water boils;
- with the lid open;
- in the absence of water;
- when removing the kettle from the stand.
The kettle is equipped with an anti-scale filter, which can be easily removed and washed.
Philips HD 4646- the best-selling model of this brand. Many users advise buying because they believe that for very little money you will get the perfect branded kettle. Reliable, simple, voluminous (1.5 l.), powerful (2400 W), boils quickly and without unnecessary noise.
– this small elegant kettle (only half a liter of water) and low power (only 600 W) will not irritate you with noise at all. It can be used both permanently and as a road option. The set includes two travel cups. The lightweight model is made of high-quality plastic, has a closed spiral, and is very convenient to use.
– this model is characterized by: volume 1.6 l, power 2200 W, closed heater (disc), removable anti-scale filter. The kettle body is made of high quality of stainless steel with decorative enamel coating. Bright illumination of the water level scale complements original design. An excellent model for true aesthetes and the noise level will not bother anyone.
– another model of a quiet, miniature, but quite decent electric kettle. Volume 0.600 l, power 700 W, closed spiral (disc), combined body made of metal and plastic. One of those copies that you can travel with.
The only device that can boil water almost silently is a thermopot. Compared to an electric kettle, a thermopot takes much longer to bring water to a boil. And with a very slow boiling process, there will be less noise. In addition, the thermal insulation (double walls), characteristic of thermopots, perfectly absorbs sound. But the problem is that many people need an electric kettle, and not a thermopot with its slow boiling and subsequent temperature maintenance mode.
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Why does the kettle make noise when the water boils, and the closer to boiling, the louder, and when the water boils, much weaker? and got the best answer
Answer from Oriy Melikaev[guru]
The cause of any sound is mechanical vibrations of the medium. In a subcooled liquid, steam bubbles do form on a hot surface, but they do not rise to the surface. As the bubble grows, its “top” touches the colder liquid, the vapor condenses and the bubble collapses. That is, the bubble “breathes” all the time. This leads to fluctuations in the water in the kettle. This process continues until all the liquid has warmed up to the boiling point - the bubbles no longer collapse, but rise to the surface.
Answer from *Janelle*[guru]
Well, because... The water gurgles and boils, the molecules begin to move faster due to the high temperature, and that's why...
Answer from Philip petrov[guru]
It seems to me because before boiling, many small steam bubbles make noise, and by the time it boils they simply merge and large bubbles no longer make so much noise
Answer from Alexander Greshnev[guru]
Bubble boiling of water turns into film boiling.
Answer from Gena Vasilkovets[guru]
THERE ARE TWO ANSWERS:
1. Microorganisms begin to scream that they should not be cooked.
2. Steam bubbles, which form at the bottom of the kettle on microcracks or non-wettable droplets of fat, rise to the surface and eventually burst and all the steam accumulated in them comes to the surface. There are a lot of such bubbles, so the noise is loud. When the kettle boils, the bubbles become larger, but their number is smaller, and the noise weakens. In general, it’s better to find Ladsberg and read him. This seems to be volume 1.
Answer from Alex[newbie]
And if the water boils away, it will stop making noise altogether.
Answer from User deleted[master]
Noise is a mysterious and enigmatic thing!
Answer from Vladimir[guru]
The air is noisy. When water is heated, the solubility of gases in it is greatly reduced, and the main amount of dissolved air is removed at a temperature close to the boiling point. My statement is easy to verify: pour carbonated mineral water into a kettle and heat it - much more carbon dioxide dissolves in water than air and the effect of noise when heating soda is very distinct.
Answer from Moby Dick[guru]
The noise that we hear when the kettle boils is, oddly enough, the sound of collapsing steam bubbles, which, rising upward, cool. When the water has already boiled, the collapse process stops, and the sound abruptly changes its character.
Answer from Cor48[guru]
Everything is correct about the collapse of steam bubbles, but the increase in sound is related to the size of these bubbles; the larger they are, the stronger the hydraulic shock when they collapse and, as a result, the louder the sound.
Answer from Olga Abramova[newbie]
The kettle is noisy, which is not good, as they said before, it doesn’t always make noise.
Answer from Irina Farrakhova[newbie]
The cause of any sound is mechanical vibrations of the medium. In a subcooled liquid, steam bubbles do form on a hot surface, but they do not rise to the surface. As the bubble grows, its “top” touches the colder liquid, the vapor condenses and the bubble collapses. That is, the bubble “breathes” all the time. This leads to fluctuations in the water in the kettle. This process continues until all the liquid has warmed up to the boiling point - the bubbles no longer collapse, but rise to the surface.
Every day, in hundreds of millions of kitchens around the world, water boils several times a day. And every person at least once in his life has asked the question: “why does noise appear before boiling?” Someone immediately remembers school curriculum and the unusual word “cavitation” comes to mind.
“Some bubbles are bursting - that’s why there’s noise,” the subconscious helpfully prompts. But few people remember the exact course of the process. And, moreover, few people know that noise is created simultaneously by two phenomena.
What is boiling?
What is boiling? There is a clear definition: “Boiling is vaporization that occurs simultaneously throughout the entire volume of liquid.” To start the process, the following conditions must be met:
- Availability of steam generation centers;
- Constant heat supply;
When a liquid reaches a certain temperature, called its boiling point.
Why do steam bubbles form in boiling water?
The centers of vaporization around which bubbles begin to appear are small cracks, greasy spots, solid particles - dust particles. They trap small volumes of air, and the liquid traps the air until it begins to boil. Water also contains dissolved gases: oxygen, nitrogen, carbon dioxide. The bonds between gas molecules and water molecules are weak and quickly break down when heated. When the dissolved gas is released, the pressure of the water forces it to take on the most energy efficient shape - a spherical shape. You get bubbles.
After gas is released, heat begins to separate liquid molecules. Steam is formed, which is released into the already formed bubbles. This is how the boiling process begins.
Causes of noise when boiling
The first signs of boiling can be observed at the bottom of the kettle - there is the highest temperature, and this is where the first bubbles appear. Each of them contains gas and saturated steam. While the bubble is small, it is held in place by forces surface tension. Then fast-moving water molecules, which form steam, accumulate inside the bubble and it begins to expand. Separation occurs at the moment when the Archimedes force pushing out the bubble becomes greater than the tension forces holding it back. The bubble is released and rushes to the surface
The separation causes fluid vibrations. It is these vibrations that are the first cause of noise during boiling.. You can estimate the frequency of the resulting sound. It is inversely proportional to the time it takes for the bubble to rise from the bottom. Time characterizes the strength of the vibration caused by the separation.
Calculations have shown that the average lift-off time is about 0.01 seconds, which means the sound frequency is about 100 Hz. It was these data that allowed scientists to understand that there is some other reason for the noise when the kettle boils. After all, the real sound frequency was measured and turned out to be an order of magnitude higher than calculated.
The discovery of the dual nature of noise was made by Scottish scientist Joseph Black. This happened in the 18th century, during his work at the University of Edinburgh.
The main source of noise when water boils
It was Joseph Black who first investigated the boiling process and identified the source of the additional noise. He discovered that not all bubbles breaking away from the bottom and walls reach the surface. And at the very beginning of the boiling process, not a single bubble reaches the surface - they disappear in the water column.
The phenomenon interested the scientist so much that he spent several sleepless nights trying to discover the reason for the disappearance of the bubbles. Research helped to draw the right conclusion. The answer turned out to be simple - temperature difference. At the beginning of their movement, the bubbles are in the hottest part of the vessel. The pressure of saturated vapor allows them to maintain a spherical shape.
Sound change when boiling water
As they move upward, the bubbles enter cooler layers. The steam begins to condense, the pressure inside drops. At some point it can no longer hold its shape and collapses. The phenomenon of formation, separation and collapse of bubbles during boiling was called “cavitation”. Were held necessary calculations, which showed that the sound frequency during collapse is close to 1000 Hz. The data correspond to the experimentally measured parameters. As the liquid heats up, the bubbles stop collapsing and the noise level changes. The sound frequency decreases noticeably. Soon, all the bubbles without exception reach the surface. The noise subsides and a “gurgling” occurs.
The birth, separation, ascent and bursting of bubbles is a physical phenomenon that millions of people see every day. But boiling is more complicated than it seems at first. Two processes can be distinguished: cavitation and liquid oscillation during bubble separation. Both produce a characteristic sound, but the acoustic effect of one is easy to distinguish from the other. You can easily determine by the noise when the water in the kettle has heated to the desired temperature.
