• Saturday March 28,2020

Condensation

We explain to you what condensation is and under what conditions it occurs. In addition, what are evaporation and inverse sublimation.

Condensation is observed when hot air collides with a cold material.
  1. What is condensation?

Condensation is a type of phase change or state of matter aggregation. Specifically, it occurs when a gas passes into a liquid form after losing caloric energy, being at near ambient pressures. It usually occurs when the gas is a vapor.

This process is the opposite side of evaporation or vaporization. It should not be confused with liquefaction, which is the transformation of a gas into a liquid by significantly increasing the pressure at which it is found.

Condensation occurs when a gas cools (loses heat) until it reaches its dew point, which can vary depending on the pressure at which it is. The surface on which the gas condenses should have a surface temperature below the saturation temperature of the gas (that is, the temperature at which it changes from a liquid to a gas phase).

Thus, the gas releases the retained heat and is deposited in the form of small drops on the surface. This is why we feel much more heat in a humid environment: the small drops of water that are deposited on our skin release the retained heat on it, thus being able to recover its liquid form.

Condensation can be artificially reproduced with the help of a device called a condenser . In fact, condensation is part of the mixing separation mechanism known as distillation.

Even so, the best example of this phenomenon occurs in nature and it is the dew itself that we find in plants, walls and glass exposed to night cold, in environments rich in humidity, or on the surface of the bathroom mirror after giving us A hot shower

See also: Physical change

  1. Evaporation

The process contrary to condensation is evaporation or vaporization, in which heat energy is introduced into a body of matter in a liquid state, until it reaches its boiling point, from which the liquid begins to become steam .

This point varies depending on the nature of the liquid, the water being 100 ° C, and also being influenced by the pressure conditions that this physical phenomenon is occurring.

  1. Reverse sublimation

Frozen dew is a natural example of inverse sublimation.

Sublimation and inverse sublimation are processes similar to evaporation and condensation, respectively, with the proviso that the phase change of the gaseous matter does not occur with the l state liquid, but with the solid directly.

That is to say that in sublimation, instead of converting a solid to liquid and then to gas, a solid is transformed directly to gaseous. In reverse sublimation, a solid is obtained directly from a gas, generally in the form of crystals. For this process to occur, very specific atmospheric pressure conditions are required.

Continue with: Water States


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