What is the reason why the temperature is still rising when the water is boiling

Generally speaking, one atmosphere.

Below, the temperature of water boiling is 100, will not change, the premise mentioned here is an atmospheric pressure, then under different atmospheric pressure, the temperature of water boiling is of course different, the higher the air pressure, the higher the temperature when boiling, so here to make the water in the boiling, the temperature continues to rise, there is only one condition, that is, the air pressure is constantly increasing, and the realization of this is also very simple, the general pressure cooker.

Yes, boil water with a blazing fire, the water will boil when it rises to 100 in a short time, and a large amount of water vapor will be produced when boiling, increasing the pressure, then the temperature at which the water needs to boil will be higher and higher, which is a vicious circle, and the final result is the pressure cooker**.

Another possibility is that non-pure water, most of the elements in nature are constant temperature when melting and sublimating, and the vast majority of mixtures are variable temperature when melting and sublimating.

Unless it's not pure water.

The boiling point of pure water is 100 degrees Celsius under standard conditions, and if the heat continues to heat up after reaching this temperature, the heat absorbed by the water will not continue to heat the water, but will increase the Brownian motion speed of the water molecules (the water will evaporate into water vapor after reaching the speed of the gas). So when the water boils, it doesn't heat up anymore. Unless it's not pure water, like water mixed with impurities or something, such as oil and water.

There are two ways in which a substance changes from a liquid state to a gaseous state (i.e., vaporization) i.e., evaporation and boiling. At a certain pressure, the temperature corresponding to the saturated vapor pressure of a substance equal to this pressure is called the boiling point. The amount of liquid that is dispersed into the air by evaporation over a certain period of time is called evaporation.

This is due to the difference in the magnitude of cohesion between the molecules of the liquid. In addition, liquid evaporation not only absorbs heat but also cools the surrounding objects. Evaporation and boiling are different ways of vaporization, but from a phase transition perspective, there is no fundamental difference between them.

Regardless of evaporation or boiling, the liquid absorbs heat when it becomes a gas of the same temperature. Boiling is the vaporization of a liquid at a certain temperature (boiling point) and continuing to heat up. Evaporation is a slow vaporization that occurs only on the surface of a liquid; Boiling is a violent vaporization phenomenon that occurs simultaneously on the surface and inside the liquid.

When the temperature of the liquid rises to a certain level under a certain pressure, the phenomenon of rapid vaporization of the liquid surface and the inside of the liquid at the same time is called boiling. When boiling, a large number of bubbles emerge inside the liquid. At this time, the heat provided by the outside world is used to change the substance from a liquid state to a gaseous state, and the temperature of the liquid does not change, which is called the boiling point.

The boiling point is related to the properties of the liquid. At the same time, because when a liquid boils, the vapor pressure in the bubbles inside it must be at least equal to the ambient pressure before the bubbles can expand and rise, so the boiling point is also related to the ambient pressure. The relationship between boiling point and pressure can be derived from the Clausius-Clapperon equation.

For water, the boiling point rises by 1 K for every 3 6121 103 pa increase in ambient pressure. The boiling point at one atmosphere pressure is the normal boiling point.

Evaporation and boiling are different ways of vaporization, but from a phase transition perspective, there is no fundamental difference between them. Regardless of evaporation or boiling, the liquid absorbs heat when it becomes a gas of the same temperature. The heat absorbed by a unit mass of liquid into a gas of the same temperature is called the heat of vaporization.

If the water is boiled and heated, the temperature of the water will not change. However, if the heating is stopped, the temperature of the water will gradually decrease.

This is actually a very simple physics knowledge. Because the boiling point of water is actually 100 degrees. In other words, when the temperature reaches 100 degrees Celsius, the temperature of the water will not change.

At this time, the maximum temperature of the water is 100 degrees Celsius, and there is no difference. Even if you put more fire underneath, even if the water temperature has been increasing, even if the water has disappeared, then the water temperature is still 100 degrees without any difference.

Therefore, if the water continues to be heated after boiling, the temperature of the water will not change in any way, because it has reached the highest temperature, so there can be no difference, and there can be no change, and the temperature has become the top.

But when the water temperature stops heating, some changes will occur, because the highest boiling point needs to be maintained by a higher external energy, and if you don't have this kind of fuel and energy from the outside world, the temperature will slowly decrease.

So when the outside world stops heating, its temperature will continue to decrease. So if you stop heating, it will slowly decrease in temperature, but when it reaches a certain point, it will slow down more and more slowly.

Therefore, if you cool down as a whole, it is a question of the specific heat capacity of water. Because the specific heat capacity of water is still very large, it can put a lot of this temperature, so even when it heats up and cools down, it is relatively slow and not so fast.

Therefore, regardless of heating or cooling, you can use this property of water, so this water is also a better conductor of this kind.

So this is a very simple knowledge, one is about the boiling point of water, and the other is about the specific heat capacity of water, so the temperature of the water continues to heat when the water is boiling, and the temperature of the water will gradually decrease when the flood stops heating.

And you can do this experiment at home. Take a thermometer with a higher temperature and test it while heating a kettle all the time.

Take out the kettle when it is not heated below, and measure how high the temperature in the water is every 30 seconds or a minute, so that you know how the temperature of the water will change, in fact, all the physical knowledge or a lot of chemical knowledge is in our lives, as long as you look for it yourself, there will be many answers.

As long as the atmospheric pressure does not change when the water is boiling, the water temperature will not change if the water is heated continuously! Because this is when the water has reached the boiling point at that atmospheric pressure! When the heating of the water is stopped, because there is no heat to continue to transfer to the water, the water and the air or things close to the water (these things are cooler than the water at that time) will transfer heat, which is the heat transfer of the water, and the water will slowly become cooler!

The phenomenon we see with the naked eye when boiling is that the water is churning violently, this is because the dissolved air in the water will rise up from the water when the density becomes smaller when it is heated (that is, the reverse process of dissolution) will bring out a part of the water at the same time as it emerges, but the gravity of the water is greater than that of the air, so when the water droplets are just exposed to the air, they will fall back into the water, so that countless water droplets staggered up and down to form a boiling scene!

Expansion: The phenomenon of boiling is the violent vaporization of the surface and interior of a liquid at the same time. Different liquids have different boiling points. Even if it is the same liquid, its boiling point changes with the change of atmospheric pressure outside, and boiling is also used for cooking.

In addition, the higher the atmospheric pressure, the higher the boiling point of the liquid, and vice versa. Water has a boiling point of 100 at a standard atmospheric pressure, which is the most common. At a certain external pressure, boiling can only be carried out at a certain temperature (boiling point) and continuous heating.

After the water boils, continue to heat it, the temperature of the water will not change during the boiling process, the heat obtained by the water directly makes who becomes gaseous, when the heating is stopped, because its boiling point temperature is higher than the environmental dimension, and can not be supplemented by heat, so the temperature will gradually drop due to the gradual loss of heat. The evaporation rate gradually decreases.

Boiling means that the water is vaporizing, and vaporization needs to absorb heat, and if it boils all the time, it will always vaporize and absorb heat.

From a microscopic point of view, when boiling, the inside and surface of the water undergo intense vaporization at the same time, and all the heat absorbed is used to increase the potential energy of the molecule (without increasing the kinetic energy of the molecule), so that the water changes from liquid to gaseous, and the kinetic energy of the molecule does not increase, so the temperature remains unchanged.

First of all, it needs to be clear that the condition for water to boil is that the temperature of the water continues to absorb heat after reaching the boiling point. In general, after heating water to the boiling point, the water near the heating source is heated above the boiling point and becomes gaseous, and the water vapor density is small so that it rises, and at the same time, heat conduction is carried out to the surrounding water. This caused the phenomenon of boiling.

In the pressure cooker, due to the high-pressure environment, the boiling point of water can reach more than 100, at this time, if the pressure is removed and the lid is uncovered, because the temperature of the water is still more than 100, and the surface water due to the cooling of the air and the temperature difference between the lower water, it will produce heat conduction, which is equivalent to the surface water is still at the boiling point and is heated by the lower water, so the water will still boil at this time. The subject's question should be that if the boiling water is immediately removed from the heating source, the instantaneous temperature should still be at the boiling point, so it should continue to boil, right? In fact, there will still be high-temperature water vapor in the water at this time, which will heat the surrounding water, so the water will still boil for a short time after removing the heating source.

Seeing that some of them are explained by the thermal motion of molecules, the essence of temperature is to measure the intensity of the thermal motion of molecules, and one of the phenomena of thermal motion of molecules is pressure.

After the water boils, as long as the pressure does not change, its temperature does not change, and the heated heat is used to change the state of the water. When the heating is stopped, there is a loss of energy due to the transfer of heat to the surroundings, which lowers its temperature.

Because water will only boil when it reaches a certain temperature, this temperature is the boiling point of water, and the water continues to absorb heat when it boils, and the temperature no longer rises As can be seen from the image, the temperature of the AB segment has been increasing, so the water has not yet boiled BC segment continues to absorb heat, but the temperature is no longer rising, indicating that the water is boiling

Therefore, choose D