Place a glass of 50 degrees Celsius water and a glass of 100 degrees Celsius water in the refrigerat

If two cups are the same size, the 50-degree water freezes first. Water at 50 degrees absorbs half the heat energy of 100 degrees, and when it is exothermic at the same time, the water at 50 degrees first reaches 0 degrees, and then continues to exothermic and begins to freeze. Hope you are satisfied.

50 degrees of water. Water at 100 degrees Celsius dissipates heat quickly, but when it reaches 50, it will dissipate at the same rate as when it starts to cool down at 50. So it can't be faster than 50's.

It's like acceleration, 100 degrees is big, 50 degrees is small. But they are all variable acceleration motions. When 100 water reaches 50, it repeats the same steps as 50.

So 50's first knot.

100 freezes first, because the speed of heat transfer is related to the temperature difference between the heat-absorbing object and the exothermic object The larger the temperature difference, the faster the heat transfer. The molecular movement is more intense, so the water at 100 degrees Celsius freezes first

I think it should be 50 to freeze first, and the water starts to freeze when it reaches 0 degrees. I think it would be quicker for water from 50 degrees to 0 degrees. But that's just what I think, but if it were on a physics question I'd think the answer would be frozen at the same time...

This is the Mpemba phenomenon, and icing is simply a physical change that occurs on the surface of a liquid. However, the Mpemba phenomenon does not mean that the hot water will freeze before the cold water, and if there is a large difference in temperature between the two, the cold water will still freeze first.

You should try it yourself, hot water and refrigerators are available in almost every family, and in principle, hot water should freeze first, the temperature difference is large, the heat dissipation is fast, and the cooling is fast.

See which cup has more heat energy and freezes after more.

When Mpemba was a primary school student, the teacher took them to do a water freezing experiment, and Mpemba put a cup of cold water and a cup of hot water in the freezer compartment of the refrigerator at the same time, strange! The hot water freezes first, and the teacher thinks he got the wrong cup, so he marks the cup and then does it, but the hot water freezes first. They sent the question to the relevant scientific journals, and the question also caused confusion in the scientific community, hence the famous Mpemba mystery.

In the Mpemba problem, there is a problem of the inertia of the motion of matter, the inertia of the motion of a valence and electrons is insignificant, but the inertia of the valence of the whole matter and the motion of the electrons is not negligible. Everyone knows that 0 water and 0 ice coexist, and the cold water is slowly cooled to 0, and the water is still water, and it does not freeze, that is, the valence of water and electricity still maintain the original way of motion. Cool the water below 0, and when the water starts to freeze and then back to 0, the water will freeze.

That is to say, after the water has been supercooled, even though part of the valence and electrons move from the interchange to the plane, once this mode of motion begins, all the valence and electrons will enter a new state of motion according to this trend.

The temperature difference between the cold water in the refrigerator and the outside world is small, and the electrons outside the core slightly radiate electromagnetic waves to the outside world, while slowly reducing their valence and operating rate. Because the temperature difference is not large, this kind of radiation and cooling is generally on the surface of the substance, and the overall material cooling has a transfer process from the inside to the outside, and it takes a long time to make the overall valence and electron operation gradually return to the orderly plane operation from the interchange, so that the water freezes.

The hot water in the refrigerator has a large temperature difference with the outside world, and the cooling range is very large, and the electrons outside the nuclear outside the surface of the material and inside radiate electromagnetic waves to the outside world, which quickly reduces its own valence and operation rate, and the movement circuit of the first cooling part of the valence and electrons immediately returns from torsion to plane operation, so that the direction of electromagnetic force changes from twisting to stability. The stable and orderly electromagnetic force makes the surrounding twisting electromagnetic force quickly submissive, and quickly forms a continuous frame with fixed alignment, and the hot water quickly freezes into ice.

In fact, hot water can't be put in the refrigerator, it's harmful.

And this. Put the hot water in the refrigerator and cool it first.

1. The Mpemba effect.

It is often assumed that when a glass of cold water and a cup of hot water are placed in the refrigerator at the same time, the cold water freezes quickly. This is not the case. One day in 1963, in a middle school in Tanzania, in tropical Africa, a group of students wanted to make some frozen food to cool down.

A student named Erasto Mpemba added sugar to hot milk and prepared to put it in the fridge to make ice cream. He thought that if he waited for the hot milk to cool and put it in the refrigerator, then other students would fill the refrigerator, so he put the hot milk in the refrigerator. Soon after, he opened the refrigerator and saw that his cup of ice cream had turned into a delicious cup of ice cream, and the ice cream made by other classmates with cold water had not yet frozen.

His discovery did not attract the attention of teachers and classmates, but rather made them laugh. Mpemba told Dr. Osborne, a professor of physics at the University of Dar es Salaam, about this particular phenomenon. Osborne was also a little surprised to hear Mpeba's account, but he believed that what Mpemba said must be the truth.

Respect for science, Osborne conducted another experiment, and the results were exactly in line with Mpemba's account. This confirms that hot water freezes faster than cold water at low temperatures. Since then, many scientific journals around the world have published articles about this natural phenomenon and named it"The Mpemba effect"(mpembaeffect)。

At first glance, our first impression is that of course the cold water freezes fast. But that's not the case. If you put two cups of water of equal weight in the refrigerator, one cold and one hot, they will start to lose heat in the refrigerator at the same time.

It's cold water. Hearing is false, seeing is believing. I did the experiment, and the cold water froze first.