Will a piece of ice sublimate as much as the ambient temperature he is in? What factors are involved

As shown in the figure, this is the phase transition diagram of water, the line between the solid state and the gaseous state is the place where sublimation can occur, and as the temperature increases and the pressure decreases, the phase transition from solid to gaseous can occur in a specific area, which is the so-called sublimation.

It will sublimate, but it will also solidify, only at the same rate for both.

Factors: temperature, pressure, properties of the substance itself, etc.

It will sublimate, and it is related to the activity of the water molecule itself.

Ice will slowly sublimate at any temperature.

Therefore, as long as the ambient temperature is not above freezing, the ice will sublimate without melting. In winter, the snow cover slowly decreases even if it does not melt, because of the sublimation.

When a dry wind blows through the snow in the mountains, a part of the snow "disappears", and the "disappearance" process does not involve the appearance of liquid water. This is because the snow has sublimated into water vapor.

A concrete example is snow in the Rocky Mountains: when the chinook winds blow from the Pacific Ocean to the Rocky Mountains, the wind is not low (around 15) but dry (less than 10% humidity), and when this wind blows the snow on the mountains, the snow sublimates and no snow water appears.

Hello subject, sublimation is a physical phenomenon in which a solid substance becomes a gaseous state. From the definition, any substance, at any temperature, there is a possibility that a small number of molecules or atoms will diffuse out, which should be called sublimation. However, in daily life, what is visible to the naked eye is the sublimation of solid ice, and the water molecules on the surface of the ice sculpture will enter the air and become gaseous water molecules at any temperature, so it will also be sublimated.

Sublimation refers to the direct transformation of a solid substance into a gaseous state without going through a liquid state. Iodine, camphor, naphthalene, ice, etc., are all easy to sublimate.

Sublimation needs to take place at the right temperature, of course, but this "right temperature" means a relatively low temperature, not a high temperature that can melt (melt) the substance!

If at high temperatures, the substance becomes liquid and then gaseous, then it is not sublimation!

So, the ice sublimation must be below 0 degrees Celsius! Above 0 degrees Celsius, the ice melts into water and then into water vapor, which is evaporation rather than sublimation.

Sublimation refers to the process of directly changing a substance from a solid state to a gaseous state, which must be carried out at a certain suitable temperature. Because some substances may melt first during heat absorption and then vaporize without sublimation during sublimation. For example, in the experiment of heating iodine sublimation, we use the water bath method, the flame temperature of the alcohol lamp is about 400, and during the heating process, the temperature has exceeded the melting point of iodine 114, and the iodine may melt first.

The iodine vapor from solid to liquid state, revaporization, and from liquid state to gaseous state is not necessarily the sublimation phenomenon of iodine from solid state to gaseous state.

Heated with hot water, the temperature of the water in the beaker is up to 100, the iodine can not reach the melting point, the melting phenomenon will not occur, the iodine has been in the solid state, and the iodine vapor can only be directly changed from the solid state, which can better explain the sublimation of iodine.

Sublimation is the phenomenon in which a substance changes from a solid state to a gaseous state without going through a liquid state. As long as some substances can absorb heat from the outside world, sublimation can occur.

After icing (the process of freezing is called solidification), the process of changing from solid (ice) to gaseous (water vapor) is called sublimation; After boiling, the process by which water changes from a liquid state to a gaseous state is called vaporization. It's a physical phenomenon.

If the partial pressure of water vapor in the air is lower than MPa, the temperature of ice below Kai, when it absorbs heat from the outside and the temperature rises, the ice will be directly sublimated into vapor, and the sublimation of ice is the process of molecular movement, as long as it is below zero, the ice will be sublimated.

In an atmospheric environment, the melting point of ice is 0. 0 When water freezes into ice, it increases in volume by about 1 9 (the minimum volume of water is 4). It has been observed that when water freezes under closed conditions, the pressure generated by the increase in volume can reach 2500 atmospheres.

Theoretically.

Ice melts above freezing, and when it boils near high temperatures, it turns into water vapor and sublimations.

In fact, when the water is cold, it also changes to water vapor sublimation, but it is not violent.

The sublimation and melting of ice is not only related to temperature but also to pressure.

In general, just remember that the ice melts at 1 atm (and 0 (melts on it.)

As shown in the figure below, the pressure p = and temperature t = of the triple point o of water i.e., at pressure and temperature, the three phases of water vapor, water, and ice coexist. If the pressure is higher, as the temperature increases, the ice will first melt and then vaporize, and there is no sublimation; If the pressure is lower, the ice directly vaporizes (sublimates) as the temperature increases.

Sublimation occurs at any temperature and melts at temperatures greater than 0 degrees Celsius.

At standard atmospheric pressure, melting and sublimation occur at the same time, even if the temperature is greater than 0 degrees. The process of conversion to gaseous state is happening all the time, just like molecular diffusion.

Under standard conditions, it melts at more than 0 degrees Celsius and sublimates at less than 0 degrees Celsius. Because sublimation only has to be converted directly from a solid state to a gaseous state, it only occurs below 0 degrees Celsius. Above 0 degrees Celsius is called evaporation.

I've never heard of the conclusion of the first sentence of your question, or your first sentence is completely incomplete

In fact, I blindly guess that the first sentence of your Sencha is to say that the object that can be melted, if it reaches the melting point, it will only observe melting, and not sublimation, in fact, this conclusion is fundamentally wrong, even if it is ice, placed in an environment of 20 degrees, it should also be sublimated and melted at the same time. Of course, we can only clearly observe this waxing process.

Objects that exceed the boiling point are unconditionally sublimated directly.

Summary. Kiss <>

As the ice melts, the temperature continues to rise until it matches the ambient temperature. The temperature of the ice will not continue to rise in the process of melting, but the ice below zero melts into zero degree water, the freezing point of the ice is zero degrees, and the water below zero degrees will form ice, and zero degrees is the coexistence state of ice and water, at this time, if the outside temperature is greater than zero degrees, the ice can absorb energy and slowly melt into zero degree water, and then rise the temperature after the ice is fully melted. <>

When <> ice melts, the temperature continues to rise until it matches the ambient temperature, right?

Kiss <>

As the ice melts, the temperature continues to rise until it matches the ambient temperature. The freezing point of the ice is zero, and the water below the zero degree will freeze, and the zero degree is the coexistence of ice and water, at this time, if the outside temperature is greater than zero, the ice can absorb energy and slowly melt into zero-degree water, and the water absorbs heat energy and then rises the temperature after the ice is fully melted. <>

<> is true/false, elementary school science lessons.

That's right. Okay.

So this question is correct, right?

Are you taking an exam?

That's right. The child's exam review questions, so unsure, just ask.

That's right. Kiss <>

Ice: Ice is characterized by having a fixed shape, not flowing, being solid, and having a fixed melting point. Ice is the solid form of water in nature, it is the crystalline body of water, and it is a colorless and transparent substance like water.

When the water is below 0, it will form ice, and the ice will have a certain shape, occupy a certain space, and will float on the surface of the water. When the temperature rises above zero degrees Celsius, the ice begins to melt and turns into liquid water. Physical properties of water:

Water is a colorless, tasteless, non-toxic, transparent liquid that is drinkable, and pure water does not conduct electricity easily. At standard atmospheric pressure, the freezing point of water is 0 and the boiling point is 100. Many common gases can be dissolved in water, such as hydrogen, oxygen, nitrogen, carbon dioxide, inert gases, etc.

<>Looking forward to the potato difference] [the number of periods to be treated] <>

1. Dry ice sublimation is a physical change, generally because after the sublimation of dry ice, it is from solid CO2 to gaseous CO2, and no new substances are generated, so dry ice sublimation is a physical change.

2. Dry ice is solid carbon dioxide, which is obtained by liquefiing carbon dioxide into a colorless liquid at a pressure of kilopascals, and then quickly solidifying it at low pressure. Nowadays, dry ice has been widely used in many fields.

3. The pressure generated by the sublimation of dry ice will cause **, so dry ice should not be stored in an airtight incubator.

1. Dry ice sublimation is a physical change, generally because after the sublimation of dry ice, it is transformed from solid CO2 to gaseous CO2, and no new substance is generated, so dry ice ascension is a physical change.

2. Dry ice is solid carbon dioxide, which is liquefied into a colorless liquid under a pressure of kilopascals, and then quickly solidified under low pressure. Nowadays, dry ice has been widely used in many fields.

3. The pressure generated by the sublimation of dry ice will cause **, so it is not possible to store dry ice in an airtight incubator.