Why boiling water turns into ice cubes faster than cold water

Warm water freezes faster than cold water.

Experienced car drivers know that it is best to wash the car in winter with cold water instead of lukewarm water, otherwise the warm water will freeze immediately as soon as it touches the cabin. Does warm water freeze faster than cold water? Why is that?

Today's science and technology ** report that in fact, it is very normal that this strange natural phenomenon cannot be explained, because so far, even scientists have not figured out: why does warm water freeze faster than cold water in winter? No one in the world today has been able to solve this seemingly ordinary mystery of nature.

It is said that the ancient Greeks discovered this interesting natural phenomenon, but they did not find the answer.

In 1969, a Tanzanian university student, Erasto Mubimba, formally asked the world the question – why does warm water freeze faster than cold water in winter? Since then, this issue has only been brought to the attention of scientists around the world. It is said that in the summer of 1969, when Erasto Mubimba wanted to make his own ice cream, he put a cup of warm liquid mixed with milk and sugar water into the freezer compartment of the refrigerator, and he was surprised to find that the liquid crystallized faster than ever before, and he quickly ate the ice cream he made himself.

This intriguing discovery sparked his desire to delve deeper. Since then, Erasto Mubinba has done many experiments on warm water freezing and written many research reports. Thanks to the outstanding contribution of Erasto Mubimba, this amazing natural phenomenon is now known in the scientific community as the "Mubimba effect".

Now, the most common theory in many explanations is the temperature difference theory, that is, warm water freezes faster than cold water in winter because the temperature difference between warm water and the surrounding environment is greater than the temperature difference between cold water and the surrounding environment, and the energy of water molecules in warm water will quickly dissipate into the surrounding environment. Of course, this theory is still questioned by many scientists.

Because according to this theory, the temperature difference between cold water and the surrounding environment is small, and the energy loss of cold water molecules is slower, then the problem that arises is that warm water will eventually become cold water, and the crystallization rate after it becomes cold water should be the same as that of cold water directly frozen. Therefore, considering the time it takes to cool warm water into cold water, it should be concluded that cold water should be frozen faster than warm water anyway. It seems that this "temperature difference theory" is not worth scrutinizing.

So, why does warm water freeze faster than cold water? There must be another mechanism in the freezing process of warm water, which has not yet been recognized. Perhaps in the near future, scientists will solve this mystery that is hiding all around us.

Now the most common explanation is that the temperature difference theory, that is, boiled water freezes faster than cold water, because the temperature difference between boiled water and the surrounding environment is greater than the temperature difference between cold water and the surrounding environment, and the temperature difference means that the energy of water molecules in boiling water will be quickly dissipated into the surrounding environment, so boiling water turns into ice cubes quickly.

If you try it and put a cup of boiling water and a glass of cold water in the freezer, you will find that there is a hole in this statement.

Because boiling water only needs to be changed to ice water, and it takes two words to change it to ice cubes.

No, it is faster for boiling water to turn into cold water, and it is slower for boiling water to turn into ice cubes.

Heat loss is fast, taking away a lot of heat.

It is the phenomenon of melting. The process of heating a substance to change it from a solid state to a liquid state. It is one of the more common types of state of matter.

Melting requires the absorption of heat and is an endothermic process. Crystals have a certain melting temperature called melting point. Amorphous does not have a certain melting temperature.

The reverse process of melting is solidification.

DefinitionsCrystals have a certain melting temperature, called the melting point, which is equal to its freezing point at standard atmospheric pressure. The endothermic temperature of the crystal rises and begins to melt when it reaches the melting point, at which point the temperature does not change. After the crystals have completely melted into a liquid, the temperature continues to rise.

During the melting process, the crystals are in a state of coexistence of solid and liquid.

Amorphous does not have a certain melting temperature. The amorphous melting process is similar to that of crystals, except that the temperature continues to rise and it needs to be continuously heat-absorbed.

How did the water poured into it turn into ice cubes? The magic of water to ice cubes is revealed, and the original method is like this.

(1) Ice is transformed into water, which is a liquid state into a solid state, which is a melting phenomenon, and the melting of objects is endothermic;

2) A layer of water droplets appears on the outer wall of the cup due to the condensation of water vapor in the air when it meets the outer wall of the cup at a lower temperature, which is the gaseous state becomes liquid, which belongs to the liquefaction phenomenon, and the liquefaction needs to release heat; The water vapor is liquefied by lowering the temperature

So the answer is: melting; Absorb; Liquefy; Release; Reduce the temperature

In our daily life, there are actually a lot of common sense in life, and sometimes we can use these common sense appropriately, which can bring a lot of convenience to our lives. We all know that ice freezes when the temperature is below zero degrees Celsius, but when we put ice cubes in cold water, we find that they melt faster than when we put them in boiling water, why is that? In fact, this has a lot to do with heat transfer and the temperature difference of water, so let's explain it in detail.

We all know that ice, cold water and boiling water belong to three forms with different temperatures, among which the temperature of ice reaches less than zero degrees Celsius, cold water is the normal temperature water we usually use, and the temperature of boiling water reaches 100 degrees Celsius, so among the three, there is a temperature difference between the three. In real life, we put ice cubes in cold water to melt faster than in boiling water, and there are many reasons for this.

First of all, we all know that there is a heat transfer effect in water, and heat transfer is transmitted through different degrees of temperature of objects, such as from high-temperature objects to low-temperature objects, but there is a large temperature difference between the temperature of boiling water and the temperature of ice, which will directly affect the speed of cooling of objects, so the above situation will occur. The second is that there is also a temperature difference between the ice cubes and the cold water, but the temperature difference between the two is much smaller than in boiling water, so the ice cubes can be cooled in this way.

Finally, a large amount of water vapor will be produced in boiling water, when the ice cubes are put into the boiling water, a layer of water vapor will appear on the outside of the ice cubes, in fact, there is a certain cooling effect between this layer of steam, but this layer of water vapor will hinder the heat transfer between the ice cubes and the boiling water, so this greatly reduces the cooling rate of the ice cubes in the boiling water. Through the above analysis, I believe you have a further understanding of this problem, if you want to know more, you can find some books to solve it.

Utter nonsense! Have you done this experiment? Ice cubes of the same size, one piece in boiling water and one piece in cold water, must be put into boiling water first.

If another piece of ice is put in cold water at 0, it will not melt at all. It definitely can't melt faster than if you put it in boiling water!

Don't mislead the kids!

Melts quickly in hot water.

Ice melts to absorb heat, and endothermia requires temperature differences. The temperature difference between hot water and ice is large, so it absorbs heat quickly and melts quickly.

Ice is a crystal, and there are two conditions for the crystal to melt: 1. The temperature reaches its melting point (the melting point of ice is 0 degrees Celsius); 2. Continue to absorb heat. As long as the ice continues to absorb heat, the temperature will gradually rise to the melting point, and then continue to absorb heat, and it will melt.

There are two ways to absorb heat (that is, the increase in the internal energy of an object): work done and heat transfer, which are equivalent.

The external object does work on the ice, and the internal energy of the ice increases; On the contrary, ice does work on external objects, and the internal energy of ice decreases. One situation is that if an object from the outside world does work on the ice, the ice will melt (that is, the principle of frictional heat generation). When there is a temperature difference between two objects, heat transfer occurs, and internal energy is transferred from a hot object to a cold object until the temperature of the two objects is the same.

Therefore, there is also a possibility that there is heat transfer between an object with a temperature higher than ice and the ice (in the form of conduction, radiation, and convection), so that the temperature of the ice reaches the melting point and continues to absorb heat and melt.

Extended Materials. The "Mpemba phenomenon" originated.

It was discovered in the 30s of the 20th century by a guy named Mpemba, and you might not think about what he was doing, you might think he found out in research, but he wasn't, he was just making ice cream. And by chance, he discovered this phenomenon, and I have to say that he was very lucky. However, because this phenomenon was only discovered by himself, when he told his classmates and teachers about this conclusion, everyone was distrustful.

If he were an ordinary person, it would probably have been much later for this conclusion to be discovered. Thankfully, Mpemba is not. ** He was not willing to let what he saw fall into the sea, so through his unremitting efforts, he found Dennis, a physicist at the time.

Osborne, at first, the scientist was also shocked by this anti-common sense theory, but because scientists have a curious heart, they made an exception to do a series of experiments for this person. And when the results of the experiment come out. The scientist was also amazed by the experimental phenomenon, because his experiments proved that Mpemba was not a random fabrication, but that it was true, that is, hot water can freeze faster than cold water under certain environmental conditions.

Therefore, after continuous research, the two finally studied this phenomenon and named it "Mpemba phenomenon".

Ice melts quickly in hot water.

Ice is a crystalline formation formed by the orderly arrangement of water molecules, which are linked together by hydrogen bonds to form a very "open" (low-density) rigid structure.

The spacing between the O—O nuclei closest to the water molecule is about 109°, which is very close to the 109°28 bond angle of an ideal tetrahedron. However, the O-O spacing of each water molecule that is only adjacent and not directly bound is much larger, and the farthest one should be reached. Each water molecule can combine with 4 other water molecules to form a tetrahedral structure, so the coordination number of the water molecule is 4.

Ice is a colorless and transparent solid, a product formed by liquid solidification, condensed by a freezing environment, and liquefied and dissolved at high temperatures, which is a normal natural phenomenon that can be formed naturally or artificially.

The molecules are mainly bonded by hydrogen, but there are also van der Waals forces, and the lattice structure is generally hexagonal, which is less dense than water. However, there can also be other lattice structures at different pressures.

Ice cubes melt quickly in hot water.

1. There is a temperature difference between ice cubes and cold water, and there is also a temperature difference between ice cubes and hot water. And the temperature difference between ice cubes and hot water is larger than that between ice cubes and cold water.

2. Heat can only be transferred from a high-temperature object to a low-temperature object. All other things being equal, the greater the temperature difference between the two objects, the faster the heat transfer will be, and when the objects with different degrees of cold and heat come into contact with each other, the heat transfer will not stop until their temperature is the same, that is, the thermal equilibrium is reached.

3. From the relationship between the speed of heat transfer and the temperature difference, ice melts faster in hot water than in cold water.

The melting speed of ice depends on the temperature of the water, the melting rate of ice depends on the temperature of the water, the relative temperature difference between room temperature and ice temperature, the small one melts faster, that is, the water melts faster in cold water than in hot water, but the difference in this temperature cannot be too small, for example, the ice is 0 degrees water, and it must melt faster in twenty or thirty degrees than in boiling water.

If you want to pass the test, it is very simple, freeze a few ice cubes in the refrigerator, take two pieces and put them in the natural temperature water, take two pieces and put them in the boiling water, and you will know it by observation.

Ice melts slowly in cold water, because the temperature difference between cold water and its temperature is not particularly large, and the ice in hot water melts very, very fast, because the temperature of hot water is very high, and the temperature difference between ice and hot water is very large.

According to the general belief, it seems that hot water provides more heat and that ice cubes should melt faster than in cold water. But I don't know if you know that Northeast people have such a habit, that is, to eat frozen pears in winter, they all use cold water to soak frozen pears, saying that they will be thawed soon. I don't know what kind of truth there is in this.

If you use hot water, the fibers on the surface of the meat will shrink rapidly, the external water is not easy to penetrate, the internal and external temperature is not easy to transfer, and the cold water can replace the liquid water in the ice.

No matter how low the temperature is, there is always liquid water in the ice. I just know that the theory of liquid water in the ice is a great discovery by Chinese scientists at the end of the last century, which shocked the world. So the ice melts the skin in cold water.

Under normal circumstances, ice melts faster in cold water than in hot water, because cold water can match the temperature of the ice and it will melt the ice quickly, and putting ice in hot water will make the hot water cool quickly, so the ice is not easy to melt.

Ice should dissolve faster in cold water than in hot water, and according to scientific principles, ice dissolves fastest at similar temperatures.