What is the specific physical meaning of sublimation and condensation?

Sublimation. Definition] The phase transition process of a substance from a solid state to a gaseous state without going through a liquid state is a change in the state of matter when the temperature and air pressure are lower than the three-phase point.

The phenomenon of sublimation: drying clothes in winter, there is no wind, and at low temperatures, the ice on the clothes sublimates, and the clothes are dried.

Sublimation is an endothermic process.

Condensation is the opposite process of sublimation.

Common substances that can be sublimated are dry ice, sublimated sulfur, iodine, red phosphorus, etc.

Sublimation. Definition] The phenomenon in which a substance changes from a gaseous state to a solid state without passing through a liquid state.

In the process of condensation, the substance needs to release heat.

The actual phenomena of condensation are: on winter nights, indoor water vapor often condenses into ice crystals on the window glass and gathers into ice flowers; The flask with iodine vapor is cooled and dissipated, and the iodine vapor will be directly condensed into solid iodine; The electric bulb will appear black after a long time, because the tungsten vapor formed by the heating and sublimation of the tungsten filament condenses on the wall of the light bubble into a very thin layer of solid tungsten.

Sublimation is the opposite process of condensation.

The direct change of matter from solid to gaseous state is called sublimation; The direct change from a gaseous state to a solid state is called condensation. Neither sublimation nor condensation is in a liquid state.

A small amount of solid iodine is placed in the flask, and the flask is slightly heated, and the solid iodine does not melt into liquid iodine, but directly becomes iodine vapor. When the heating is stopped, the iodine vapor does not liquefy, but adheres directly to the flask to form a solid iodine. The former is the phenomenon of sublimation, and the latter is the phenomenon of condensation.

For example, the mothballs placed in the suitcase become smaller, the outdoor frozen clothes become dry in winter, and the filament of incandescent lamps becomes thinner for a long time. The formation of "frost" in nature, the "window flowers" on the glass in winter, and the blackening of light bulbs after a long time are all condensations.

Condensation: the process by which matter directly changes from a gaseous state to a solid state; The condensation process releases heat.

Common sublimation phenomena: frost; tree hanging (rime); Grilles; Iodine vapor directly turns into solid iodine when it is cold, and so on.

Sublimation: the process by which a substance changes directly from a solid state to a gaseous state; The sublimation process requires endothermy.

Common sublimation phenomena: Frozen clothes dry in winter; The tungsten filament of incandescent lamps becomes thinner; The mothballs (sanitary balls) become smaller or disappear; The dry ice is gone; The snow in the back sun is gone; Solid iodine is heated directly into iodine vapor and so on.

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

Causes: In physics, sublimation refers to the phase transition process of a substance from a solid state to a gaseous state without going through a liquid state due to a large temperature difference.

Examples of the actual phenomena of sublimation: iodine becomes iodine vapor, ice becomes water vapor, mothballs disappear.

2. Condensation: the phenomenon that a substance skips the liquid state and changes directly from the gaseous state to the solid state. It is a change in the state of matter that occurs when the temperature and air pressure of a substance are below the three-phase point. The condensation process material is exothermic.

Causes: The conditions for the formation of condensation are relatively special, generally requiring the concentration of gas to reach a certain requirement, and the temperature should be lower than the temperature of the condensation point, such as water vapor when it is below 0 degrees Celsius, etc., and the cause of formation is generally caused by rapid cooling or sublimation.

For example, the actual phenomenon of condensation is that the light bulb will turn from transparent to black after a long time, which is heated when the light bulb is working, and the tungsten vapor formed by the heating and sublimation of the tungsten filament is condensed on the wall of the light bulb into a very thin layer of solid tungsten.

Sublimation and condensation are as follows:

In physics, sublimation refers to the process of phase transformation of matter from a solid state directly to a gaseous state; In the interpretation of language, sublimation can be compared to the refinement and improvement of certain things, the sublimation of the ideological realm, and so on. In addition, the word "sublimation" can also be used in fields such as psychology. People use the principle of sublimation, and technology becomes more developed; The sublimation at the end of the article improves the ideological realm of the article.

Condensation: The phenomenon that a substance changes from a gaseous state to a solid state without going through a liquid state. It is a change in the state of matter that occurs when the temperature and air pressure are higher than the three-phase point. In the process of condensation, the substance needs to release heat.

The conditions for the formation of condensation are more special than those of hand dispersion, which generally requires the concentration of gas to reach a certain requirement, and the temperature of the simple is lower than the temperature of the three-phase point, such as water vapor when it is lower than 0 degrees Celsius, etc., and the cause of the formation is generally caused by rapid cooling or due to sublimation.

Phenomenon of condensation: Examples of the actual phenomenon of condensation:

1.The long-used light bulb will change from transparent to black Bih's color, which is heated when the light bulb is working, and the tungsten vapor formed by the sublimation of tungsten filament is condensed on the wall of the light bulb into a very thin layer of solid tungsten.

2.On winter nights, the water vapor in the room often condenses into ice crystals on the window panes; "rime" on tree branches; The popsicle taken out of the refrigerator formed a layer of "frost"; Another example is the formation of "frost" in nature, etc., which are all condensation phenomena.

3.When iodine vapor is cold, iodine particles appear on the inner wall of the flask.

4.White edges that appear on the leaves in winter.