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Melting and solidification are both changes in the state of matter.

The process by which a substance changes from one state to another is called a change in the state of matter.

Melting: The phenomenon of a substance changing from a solid state to a liquid state. (The melting process requires endothermy).

Coagulation: The phenomenon of a substance changing from a liquid state to a solid state. (The solidification process requires exothermy).

Crystalline and amorphous.

Solids with a fixed melting temperature are called crystals, and solids without a fixed melting temperature are called amorphous.

Melting point: The temperature at which the crystal melts is called the melting point. (Amorphous has no melting point).

Freezing point: The temperature at which the crystal solidifies is called the freezing point. (Amorphous has no freezing point).

Conditions for crystal melting:1The temperature reaches the melting point, 2Absorbs heat continuously.

Conditions for crystal solidification:1The temperature is reduced to the freezing point, 2Heat is released continuously.

Vaporization: The transformation of a substance from a liquid state to a gaseous state. (The vaporization process requires endothermy, and there are two forms: evaporation and boiling).

Evaporation: A vaporization phenomenon that occurs only on the surface of a liquid surface. (Liquids can evaporate under any circumstances, and evaporation has a refrigeration effect).

Factors influencing the speed of evaporation.

1.The higher the temperature of the liquid, the faster it evaporates.

2.The greater the surface area of the fluid, the faster the hair increases.

3.The faster the air flow on the surface of the liquid, the faster it evaporates.

Boiling: A violent process of vaporization at the same temperature (boiling point) on the surface of a liquid and inside a liquid at the same temperature. (Boiling requires endothermy).

Boiling Point: The temperature at which a liquid boils. (The boiling point has a certain relationship with the pressure, the pressure is high and the boiling is high, and the pressure is low and the boiling is low.) The boiling point of water under standard pressure is 100).

Boiling conditions.

The temperature reaches the boiling point and continues to absorb heat.

Liquefaction: The process by which a substance changes from a gaseous state to a liquid state. (Liquefaction requires exothermy).

The way of liquefaction.

1.Reducing the temperature, all gases can be liquefied to a certain extent when the temperature is lowered.

Such as: dew, fog, etc.

2.Compression volume, some gases can be liquefied by compressing volume alone.

Such as: liquefied petroleum gas, liquid lighters, etc.

1.Sublimation, condensation.

Sublimation refers to the phenomenon that a substance directly transforms from a solid state to a gaseous state without going through a liquid state. (Sublimation requires endothermy).

For example, solid iodine directly turns into a little vapor, and the mothballs in the wardrobe become smaller, which are all sublimation phenomena.

Condensation refers to the phenomenon that a substance directly changes from a gaseous state to a solid state without going through a liquid state. (Ninghua needs to be exothermic).

For example, ice crystals on indoor windows in winter and frost formed in nature are all condensation phenomena.

Coagulation: It is the liquid that becomes a solid, and condensation: It is the direct change of a gas into a solid without going through the liquid stage.

Sublimation: The solid directly becomes a gas, without passing through the liquid, gas: it is the vaporization of the liquid into a gas.

When you are in physics, think more, especially in relation to life, and connect what you learn to real life, this is a very interesting course, I wish you success in your studies.

1. The state is different.

Melted, liquefied: the state is liquid.

Coagulation, coagulation: the state is solid.

Vaporization, sublimation: the state is a gas.

2. The temperature at which the change occurs.

Melting, vaporizing, sublimation: The object needs to exceed its own melting and boiling points, and the temperature is generally very high.

Coagulation, liquefaction, coagulation: The object needs to be lower than its own melting and boiling points, and the temperature is generally very low.

3. The heat changes are different.

Melting, vaporizing, sublimation: absorbing heat.

Coagulation, liquefaction, coagulation: release heat.

The concept of melting, solidifying, vaporizing, liquefiing, sublimating, condensing:

Melting: Refers to the melting of ice or snow into water due to temperature or sunlight. Or a sentence that warms a person's heart.

Coagulation: refers to the process by which a substance changes from a liquid state to a solid state when the temperature decreases.

Vaporization: Refers to the process of phase change of a substance from a liquid state to a gaseous state.

Liquefaction: refers to the process of changing a substance from a gaseous state to a liquid state, which will release heat to the outside world.

Sublimation: The process of changing from a solid state to a gaseous state in physics.

Condensation: The phenomenon of a substance skipping the liquid state and directly changing from a gaseous state to a solid state.

1. Solidification is the process of changing the substance from liquid to solid when the temperature decreases, and the temperature of the substance when it solidifies is called the freezing point;

2. Condensation, gas becomes solid, condensation is the phenomenon that the substance skips the liquid state and changes directly from the gaseous state to the solid state, which is a change in the state of matter when the temperature and air pressure are lower than the three-phase point;

3. The definition of vaporization, the change of the ant noise substance from liquid to gaseous state is called vaporization, and there are two different ways of vaporization, evaporation and boiling, both of which need to absorb heat, the effect of vaporization, and the heat absorption when the liquid vaporizes;

3. The definition of sublimation, the direct change of a substance from a solid state to a gaseous state is called sublimation, and sublimation absorbs heat.

Sublimation: The process by which a substance changes from a solid straight lead to a gaseous state.

For example, the phenomenon of sublimation can occur in canon, naphthalene, ice and snow.

For example, the blackening of the inner wall of the incandescent lamp that has been used for a long time is the result of sublimation and condensation;

Another example: in winter, the phenomenon of sublimation occurs when frozen clothes dry out;

Also: the sanitary ball has become smaller, and the clothes are not wet, which is the phenomenon of sublimation;

Condensation: The process by which matter directly changes from a gaseous state to a solid state.

For example, the frost in winter is a phenomenon of condensation and agitation.

1. Concept. Melting: When a substance is converted from a solid state to a liquid state, this phenomenon is called melting.

Solidification: When a substance is converted from a liquid state to a solid state, this phenomenon is called solidification.

Vaporization: The conversion of a substance from a liquid state to a gaseous state, a phenomenon called vaporization.

Liquefaction: When a substance is converted from a gaseous state to a liquid state, this phenomenon is called liquefaction.

Sublimation: The direct conversion of matter from a solid state to a gaseous state is a phenomenon called sublimation.

Condensation: The direct conversion of matter from the gaseous state to the solid state is called condensation.

2. Differences. 1. Melting should absorb heat, such as ice absorbing heat and melting into water; Solidification is exothermic, such as water exothermic solidification into ice.

2. There are two ways of vaporization: evaporation and boiling, evaporation occurs on the surface of the liquid, which can be carried out at any temperature, which is slow.

3. Sublimation and endothermy, condensation and exothermy.

Physics] [Liquefaction, Sublimation and Condensation] - Understanding Sublimation and Condensation.

Sublimation: It refers to the direct transformation of matter from a solid state to a gaseous state, which is called sublimationIt is an endothermic process, which is characterized by the fact that it directly becomes gaseous without going through the process of melting.

For example, mothballs used in daily life, packed in small bags and placed in a clothing cabinet with wool and the like, will slowly become smaller, from solid to gaseous to fill the entire space, playing the role of killing insects. There are also substances that are easy to sublimate: iodine, ice, dry ice, tungsten, etc.

Practical examples from life: frozen clothes dry in winter; filament thinning; Solid iodine is heated directly into iodine vapor; The dry ice is gone, etc.

Deposition: The direct change of matter from a gaseous state to a solid state is called depositionIt is an endothermic process characterized by the fact that it is directly turned into a solid state without liquefaction.

Practical examples from life: frost;Snow; tree hanging (rime); Grilles; Iodine vapor directly turns into a solid state when cold, etc.

3. The difference between coagulation and solidification: coagulation is the change of a substance from a liquid state to a solid state, which is called coagulation; The condensation is the direct transformation of the substance from the gaseous state to the solid state, which is an endothermic process, which is easy to confuse, how to distinguish it? Although both of them have become solids, there is a difference in the solid states formed.

The solids formed by condensation are characterized by softness, such as: frost; Snowflakes; Rime; Ice flowers on glass windows, etc.

The solids formed by coagulation are characterized by being relatively hard, such as popsicles, but the frost on the paper containing the popsicles is formed by condensation.

Of course, some of them are more complicated, like snow, rime, and in fact, both.

Conditions for sublimation and condensation of pure substances.

Pure matter in nature can exist in three aggregate states: solid, liquid, and gas, and under a certain temperature and corresponding pressure, the three aggregate states of solid, liquid, and qi are in the only state of equilibrium coexistence - the three-phase point. It must be noted that only the three-phase point where the solid, liquid, and gas phases of pure matter coexist in equilibrium are discussed. Since helium does not have a three-phase point where solid, liquid, and gas phases coexist in equilibrium, it should be excluded.

The temperature and the corresponding pressure number and chain value of the triple point of different pure substances are different. However, the conditions required for the sublimation and condensation of pure matter are similar. The conditions for the sublimation and condensation of pure matter are:

The temperature and pressure of the vapor of a pure substance must be below the three-phase point temperature and pressure of the substance. If the vapor pressure of a solid pure substance is lower than its three-phase point pressure, the solid substance will be sublimated directly into a gaseous state when the temperature rises. Conversely, if the pressure of a gaseous pure substance is lower than its three-phase point pressure.

When the temperature is lowered below its three-phase point temperature, the gaseous substance will condense directly into a solid state. ,3,The conditions for sublimation and condensation are the same, that is, the boiling point of the object itself is lower than the melting point. ,0,