Put boiling water and room temperature water in the refrigerator at the same time, why does boiling

Table excited, a little better attitude towards people. Because the water vapor of boiling water is much more than that of room temperature, and if the experiment is carried out, it should be that the mouth of the boiling water cup will freeze, and the water temperature at this time will still be very high, because the glass is not easy to conduct heat, which will cause the temperature of the glass mouth to be extremely low, and the water vapor will condense and freeze. ~

In 1963, Mpemba, a secondary school student in Tanzania, stumbled upon the idea that hot milk would freeze after an hour and a half of being poured into the ice tray, while the cold milk that was put in first was still a very thick liquid and did not freeze. Later, Dr. Osborn, head of the physics department at the University of Dar es Salaam, experimentally proved that the phenomenon discovered by Mpemba was true. For more than 40 years, many experiments have tried to elucidate the principle behind this phenomenon, but due to the lack of scientific experimental data and quantitative analysis, the conclusion has not been conclusive.

Since November last year, under the guidance of Huang Zengxin, a famous science and technology teacher at Xiangming Middle School, three female middle school students in Shanghai, Yu Shunxi and Ye Shasha from Xiangming Middle School and Dong Jiawen from Shanghai Middle School, began to study the Mpemba phenomenon. After four months, it was finally concluded that it is impossible for hot liquids to freeze before cold liquids in the case of homogeneous and quantitative and external temperature environments, and three possibilities that cause misunderstandings were proposed.

They believe that the Mpemba phenomenon can only occur if there is a temperature difference in the refrigerator, the milk has a different sugar content, or the sugar does not dissolve, and it contains more non-liquid components such as starch.

The refrigerator is now an indispensable household appliance in everyone's life, and everyone has a large refrigerator in their home to keep it fresh. I believe everyone has been reminded by parents not to put hot things in the refrigerator, otherwise the refrigeration system in the refrigerator will be destroyed. But there are always people who are curious to do some "anti-bone" behavior, and parents say not to do this, but they prefer to do it.

Some people are curious to put cold water and hot water in the refrigerator at the same time to see which of the two temperatures freezes first. <>

I believe that many friends will choose cold water first to freeze first, after all, hot water will reduce the water temperature before freezing. But I didn't expect this guess to be completely wrong, and after putting two cups of water at different temperatures in the refrigerator, it turned out that the hot water froze first. This result also made many netizens curious, what is the principle that causes the hot water to freeze first?

According to common sense, cold water should reach the freezing point first, and this experimental result has also caused discussion. <>

I believe you have all learned about the three forms of transformation, water can be transformed from liquid to solid and from solid to gas. The water in the experiment is a process of transforming the liquid into a solid from the wheel. In order for water to turn into a solid, the temperature must be lowered, and when the freezing point of the water is reached, the water molecules in the water can be transformed into crystal nuclei.

Only the larger the crystal nucleus, the faster the water freezes all and the skin, which is the most important principle for the transformation of water from a liquid state to a solid state. Crystal nuclei are also involved in the release of energy, and the energy of cold water does not produce drastic effects when it comes into contact with cold air. However, hot water will release a lot of energy when it comes into contact with air conditioning.

In summary, the reason why cold water freezes faster than hot water is also because the molecular movement of hot water is stronger than that of cold water. Hot water also has been absorbing a lot of cold air because of the amount of energy released. As a result, hot water freezes faster than cold water.

Moreover, the heat transfer of hot water will also have a certain effect, and the faster the heat transfer, the easier it is to freeze.

In fact, this involves the Mpemba phenomenon. Because there are hydrogen bonds in the water molecules. This is because the hydrogen bonds of hot water are longer than those of conventional water, and the force of the hydrogen bonds is smaller, so it is easier to disperse when the molecules are rearranged, and of course it turns into ice faster.

Because the freezing point of hot water is higher, higher than that of cold water, it will let the hot water freeze first.

The main thing is that the water molecules in hot water are more active, so it is easier to condense into crystals and slowly accumulate into ice.

But from the point of view of protecting the refrigerator, it is true that you can't put hot water. Because the refrigerator will deform the plastic, the foaming agent will expand, shorten the life of the compressor, increase the power consumption, the temperature in the refrigerator will rise, resulting in the temperature of other items becoming poor, and the inner wall of the refrigerator is prone to water vapor freezing. Actually, the little cousin is so young, if there is anything you don't understand, don't criticize education.

So I did it anyway. Eventually, he learned to take care of the fridge, and through me, there was nothing wrong with his approach itself. I'm sure many people will be skeptical, or think that I have distorted the facts for the sake of a child.

The conventional wisdom is that if you want to drink ice water, you have to use cold water to cool it.

It will definitely take longer to cool it with hot water. After all, it takes a certain amount of time for hot water to cool down, and it takes just as much time to cool down to ice water again. The reason why hot water freezes faster is the Mpemba phenomenon.

The discovery was made by a child named Mpemba. At the time, he was a secondary school student in the East African country of Tanzania. They can make ice cream at school.

In order to have a place to freeze his ice cream, he always adds sugar to hot milk and immediately puts it in the refrigerator. Later, he discovered that his ice cream was the fastest to freeze. Even animals take advantage of frozen depressions.

Its freezing point is significantly lower than that of water, allowing it to survive harsh winters. Some Arctic fish species also take advantage of this phenomenon. The same happens when water is boiled or heated.

Magnesium and calcium carbonate precipitate out of the water and free oxygen escapes. As a result of the removal of these components, the freezing point of the water is raised. This effect will be even more pronounced if you start using hard water (water with a high mineral content).

The above is a detailed interpretation of the problem, I hope it will help you, if you have any questions, you can leave me a message in the comment area, you can comment with me, if there is something wrong, you can also interact with me more, if you like the author, you can also follow me, your like is the biggest help to me, thank you.

This is because when hot water is boiled or heated, calcium carbonate and magnesium carbonate precipitate, and when these components are removed, the freezing point of the water will also increase, so the hot water freezes first.

That's because the temperature changes when it drops extremely, and secondly, because there are different situations, which can lead to such a phenomenon.

Because the hot water dissipates heat very quickly, it will freeze faster during the process of putting it in the refrigerator.

Because this is a natural physical phenomenon, when the hot water is cooled, the temperature will continue to drop, so the hot water freezes faster.

Because it is a natural physical scene, the temperature drops all the time when the hot water cools, so the hot water freezes quickly.