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In the Greek it is where we can find the etymological origin of the term osmosis. Specifically, it can be established that it comes from the word osmosis which is formed by two distinct parts: osmos, which means impulse, and the suffix -sis that can be translated as action.

The osmosis or osmosis is a physical-chemical process which refers to the passage of a solvent , although not of solute , between two solutions that are separated by a membrane with semipermeability characteristics. These solutions, on the other hand, have different concentrations.

A semipermeable membrane is the one that contains pores of molecular dimension . Since the size of these pores is very small, only the smallest molecules can pass through the membrane, but not the larger ones.

This means that, if one of these membranes is responsible for separating a liquid and dividing it into two partitions, various phenomena will be produced that are explained from the notions of electrochemical potential and simple broadcast .

The first concept is linked to the fact that, by adding the potential of the components of a solution, the result will be higher to the chemical components of each of them. Due to this lack of equilibrium, solvent particles will flow to the area that has the least potential, something known as measurable osmotic pressure . The solvent, meanwhile, will go to the solute to achieve a balance of the potential or to achieve that the hydrostatic pressure can balance the osmotic pressure.

More accurately we can determine that there are two clearly differentiated types of osmosis. Thus, in the first place, we find the so-called direct osmosis phenomenon that is that natural type process that takes place in all living cells and results in the extraction of pure water from what the environment is.

And then, secondly, we find reverse osmosis. This is not a phenomenon fruit of Mother Nature but it is a process invented by the human being himself and that consists in "turning" the previous type of osmosis. Hence, the aim is to obtain purified water taking as a starting point an area of ​​salt or impure water.

The way to achieve this objective is to carry out the pressure, thus promoting the passage of water through what is a semipermeable membrane. And all this in the opposite direction to that which occurs naturally.

Among the examples that we can establish to understand the process of reverse osmosis are some as simple as the one used to concentrate what is the whey of the cheese or remove the alcohol from the beer as well as the water for irrigation.

It is important to highlight that osmosis is a phenomenon that has a great importance in the physiology of cells of human beings and animals.

The concept of osmosis, on the other hand, is used to name the reciprocal influence which is registered in the individuals that form part of the same group.

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