100 degrees of water, 5 degrees of water, etc., who freezes first when cooled it is said to be 5 de

Set: 100 degrees of water and 5 degrees of water are of equal quality.

Then 100 degrees of water freezing should be cooled by 100 degrees. 5 degrees Celsius water freezes to cool down by 5 degrees.

According to q=cm t (q is the heat discharged, c is the specific heat capacity of water, m is the mass of water, t is the cooling difference).

Therefore, freezing of 100 degrees of water emits more heat than freezing of 5 degrees of water.

Because in the same condition of cooling, both the heat of each unit of time cooled is the same.

Then it takes more time for 100 degrees of water to freeze than for 5 degrees of water to freeze.

That is, 5 degrees of water freezes before 100 degrees of water.

Personal reasoning, if there is a mistake, point out the error.

First of all, you can figure out that 100 degrees of water starts at 100 degrees and ends at 0 degrees, so it takes some time to set up a process like this, first of all, to cool 100 degrees to 5 degrees, right? Let's set it to t1

Then cool two 5 degrees of water until it freezes, and the time is t2, and it is easy to compare 100 degrees and use t1 time

It is water at 100 degrees Celsius.

At the initial moment, there is no temperature difference between the upper surface and the bottom of the hot water body, but once it is cooled sharply, the temperature difference occurs immediately, in which the temperature difference between high and low in the hot water with an initial temperature of 100 is close to 15, and the temperature difference between high and low in the hot water with an initial temperature of 47 is only 10. This indicates that the temperature difference between the hotter liquids and the cooler liquids is greater than that of the cooler liquids over a period of time during the cooling process before freezing. The best explanation for why water with large temperature differences freezes first is that the higher the temperature on the upper surface of the water body, the more heat is emitted from the upper surface, so the faster it cools down and the faster it freezes.

Let's freeze at 0 degrees Celsius, and the same temperature should freeze at the same time.

Because the temperature difference between 100 and 0 is greater than the temperature difference between 5 and 0, the greater the temperature difference, the greater the heat transfer that occurs, so the water of 100 freezes first.

It should be 100 degrees of water, because at the same temperature, 100 degrees of water will release heat faster than 5 degrees of water, making 100 degrees of water temperature drop faster than 5 degrees of water, and making 100 degrees of water freeze first.

Let's do an experiment and see if the truth comes out.

I think it's 100 degrees, though.

Sea Under Sky and JMSLPY have a point.

I'm afraid it's impossible to add pure water, but it almost has an effect called something [forget] Just like there were Koreans who made water freeze at 20 degrees, but these are special cases.

100 degrees of water, of course.

Because when the water reaches 100 degrees, the water will form steam, and the steam will immediately become ice beads after being cold, so that most of the water at 100 degrees becomes ice beads, and the remaining water slowly becomes ice, compared with the 5 degrees water as a whole slowly becomes ice, of course, 100 degrees water cools faster.

100 degrees. The best way to explain this is to do your own experiments.

Usually watch CCTV10 more

Summary. The water at 100 degrees freezes first.

Due to the large internal energy of water at 100 degrees, the speed of movement between water molecules.

Fast, better able to scatter heat outward. So, it will freeze very quickly.

Experimental data on water at 30 degrees and 100 degrees who freezes first.

The water at 100 degrees freezes first. Due to the large internal energy of water at 100 degrees, the movement between water molecules is fast, and it is better able to scatter heat outward. So, it will freeze very quickly.

I want experimental data.

And I'm done.

Cooling depends mainly on the surface of the liquid; The cooling rate is determined by the temperature of the surface of the liquid rather than the average temperature of its whole; Convection inside the liquid maintains the liquid level temperature higher than the internal temperature (assuming a temperature higher than 4); Even if two glasses of liquid are cooled to the same average temperature, the original hot system still loses much more heat than the original cold system; Liquids must go through a series of transition temperatures before freezing, so it is obviously not enough to describe the state of the system in terms of a single temperature, but also depends on the temperature gradient of the initial conditions.

The condition for 100C water to freeze first is: a small amount and the same purity, in fact, a small amount of water also contains the condition of "equal amount". From the solidification characteristics of water, it can be seen that water will only solidify when the temperature reaches 0°0 and can be continuously exothermic, so we can make conjectures

The solidification speed of water is related to the rate at which it is exothermic. Based on the experimental conditions, we can further guess that when there is only a small amount of water and a large difference from the ambient temperature, the temperature of the surface water will decrease very quickly (the density will increase), while the temperature of the bottom water will be higher, so that convection will be formed, resulting in the higher temperature water releasing more heat than the cooler water in the same time

In the case of only a small amount of water and a small difference from the ambient temperature, the convection of the water is not significant.

At standard atmospheric pressure, the temperature at which water boils is 100 and the temperature at which water freezes is 0.

Boiling is a phenomenon in which a liquid is heated beyond its saturation temperature, and violent vaporization occurs both inside and on the surface of the liquid. The temperature at which a liquid boils is called the boiling point. Different liquids have different boiling points. Even if it is the same liquid, its boiling point changes with the change of atmospheric pressure outside.

Water condenses from a liquid state to a solid state below zero degrees Celsius, which is called freezing.

The temperature required for water to boil at different atmospheric pressures is also different, with 100 degrees Celsius boiling at standard atmospheric pressure and 0 degrees Celsius freezing.

The boiling temperature of the water should be determined according to the situation, and the sealing is 100 degrees Celsius, or the sealing situation is 9798 degrees.

0 degrees Celsius.

Water has a boiling point of 100 at a standard atmospheric pressureThe freezing point is 0

The lower the air pressure, the lower the boiling point, and the greater the boiling point, the higher the boiling point.

The temperature at which water boils is 100 degrees Celsius and when it freezes is 0 degrees Celsius.

The temperature that can make water freeze is 1 degree Celsius, and the boiling point of pure water is 100 and the solidification point is 0 at standard atmospheric pressure. Therefore, the temperature at which water freezes is usually zero degrees Celsius. This is a physical change that can be divided into three types, namely solid, liquid and gaseous, when the temperature reaches 0 degrees, it freezes into a solid state, and when the temperature is at 100 degrees, the water becomes water vapor after boiling.

The temperature at which water freezes is 1 degree Celsius, and at standard atmospheric pressure, pure water has a boiling point of 100 and a freezing point of 0. Therefore, the temperature at which water freezes is usually zero degrees Celsius. This is a physical change that can be divided into three types, namely solid, liquid and gaseous, when the temperature reaches 0 degrees, it freezes into a solid state, and when the temperature is at a high tremor of 100 degrees, the water becomes water vapor after boiling.

That's right. The melting point and freezing point of the same crystal are the same, but they vary with the external pressure. In the case of a change in pressure, the melting point of the ice changes, and the temperature of the ice-water mixture changes.

At a standard atmospheric pressure, the melting point of ice and water is 0 °C, when the water is solidifying and the ice is melting, it is the state of the ice-water mixture, and the temperature of the crystals remains the same when melting and solidifying, so the temperature of the ice-water mixture is always 0 °C.

Wrong. 1. In an atmospheric environment, the melting point of ice is 0. At 0, it is in the ice-water mixture stage, which is the dividing line between melting and solidifying, and it is at 0 until it completely changes its state.

The analysis from the question stem obviously does not meet the above requirements.

2. Generally, the melting point of ice is judged from two characteristics: the temperature of ice and water is 0 in the mixed state and the volume decreases when melting.

3. In terms of temperature, place the ice in a container and record the temperature change from ice to water melting. Prepare a piece of ice and put it in a cup, and the cup is left at room temperature to wait for him to melt. When some water has melted (but not melted), measure the temperature of the water with a thermometer.

As you can see, the temperature of the water is 0°C

Similarly, put a glass of water in the refrigerator, let it freeze for a while, take it out, break the ice shell on the outside, and measure the temperature of the water inside, the same is 0°C.

4. In terms of volume, 0 When water freezes into ice, the volume will increase by about 1 9.

Wrong. The condition for the existence of ice-water mixture is 0 degrees, and the formation of ice requires less than 0 degrees.

0 is the critical temperature at which water is converted into ice. That is, the temperature at which water saturated with air is in equilibrium with ice under conditions.

When the water freezes, the movement of the water molecules can not break the hydrogen bonds, the hydrogen bonds play a major role, it ties the water molecules together to form a regular spatial structure, in a crystal lattice, four hydrogen atoms are at the apex of the regular tetrahedron, and an oxygen atom is located in the center of the tetrahedron In this way, the space between the molecules becomes larger and remains certain, so the volume becomes larger when the water freezes, and the movement of molecules in water can not only break the hydrogen bond binding between water molecules, but also prevent the molecules from moving violently and causing frequent collisions between molecules. The molecules can slide relative to each other and interleave, so that they fill the gaps with each other, and thus, the volume becomes larger.

The volume of water freezing increases by 1 10, so the volume ratio of water to ice of the same mass is 10:11.

The temperature at which water boils is 100 and the temperature at which water freezes is 0;

So the answer is: 100,0