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What is sublimation?

Sublimation

In nature, it is common to find a series of changes in the states of matter which turn out to be quite frequent. Bodies can change from one state to another depending on many occasions on temperature and pressure . One of these changes can occur through sublimation , a process through which matter can be transformed directly from a solid state to a gas .

Sublimation |  What is it, process, types, causes, consequences, examples 

What is sublimation?

The sublimation is a type of change chemical that occurs when the material is in solid state changes immediately passing a gaseous state , without having the need to go through an intermediate stage of liquid .

  • What does it consist of
  • Sublimation process
  • Types of sublimation
  • Causes
  • Consequences
  • Is sublimation endothermic or exothermic?
  • Importance
  • Examples

What does it consist of

In the field of chemistry , sublimation is a process by which a substance that is in a solid state can pass to the gaseous state , a process that can be carried out without first having to go through the liquid state of the subject. This concept is also used to name an opposite method known as inverse sublimation which consists of the direct passage that occurs between the gaseous state and the solid.

It is a fairly frequent process that can be observed mainly in the water cycle. It is a transformation that the material that it needs to be able to give itself, the force of the caloric energy to be able to achieve a variable point depending on the nature of the matter, what we know by the name of sublimation point can undergo .

Sublimation process

Sublimation is a process that occurs at temperatures and pressures below what is called the “triple point” of the substance. This type of process is an endothermic change , in other words, a change in which the system absorbs heat . It is also a thermodynamic process in which there is a change in state from a solid to a gas.

The way a solid behaves when it is under normal conditions is to be able to heat up to create a drop and then, little by little, the solid particles begin to melt completely. In sublimation, a type of bubble is formed progressively without the surface getting wet, and it is deposited or crystallized immediately.

Types of sublimation

There are several types of sublimation, among which the following are explained:

  • Progressive sublimation: this type of sublimation occurs when the phase change occurs in the material in which a solid manages to go to the gaseous state immediately. This type of sublimation refers to the exact term of it, in other words they are synonymous. It is also known by the name of direct sublimation or volatilization .
  • Reverse sublimation : it is also known by the name of deposition , desublimation or regressive sublimation . It refers to the change that occurs in the phase or in the state of aggregation of matter in which a substance can go from a gaseous state to a solid state directly, without first having to go through the liquid state of the subject.

Causes

Sublimation is a process that can occur in any type of pure substance, this is due to the different conditions that may occur at higher pressures and when they are at lower temperatures that cause the transition.

Consequences

The main consequence that occurs when sublimation occurs is the change of states , an element can then easily pass into a solid phase from a gaseous phase . It is important to mention that this consequence only affects the physical part of the state of matter and not the chemical part .

Is sublimation endothermic or exothermic?

Sublimation is a process by which heat is absorbed, which is why it is classified as an endothermic process . This heat is used as a form of energy to be able to make the change between the states and it is necessary to be able to maintain the process of the change of the substance.

Importance

Sublimation is a process that has many uses and for this reason it is of utmost importance for humans and for nature. Is used to reduce the amount of snow and ice, it is also used to purify the compounds of type organic , to reveal traces fingerprints on paper and is also used for different processes and printing techniques and patterns , such as those they are seen in dye sublimation. In addition, it is important because through it you can preserve food through a process called lyophilization.

Examples

Some examples of chemical sublimation are mentioned below:

  • The dry ice to the face at a temperature of -78 ° C can be sublimated into steam carbon dioxide.
  • The iodine when subjected to a temperature of 100 ° C becomes a purple gas.
  • In the field of astronomy sublimation can be observed when comets make their way close to the sun.
  • At room temperature, mothballs can sublimate very easily.
  • In places where snow falls , when the sun heats up strongly, the ice vaporizes immediately without having to go through the liquid phase.
  • The sublimation of aluminum in some industrial processes .
  • Purification of materials in some alloys and homogeneous mixtures.

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