The permeability refers to the ability of a structure to be traversed by a fluid, or any material without the same change its structural composition, ie without being modified as comprises the material, this term has a source Latin "Permeabilis" .
Thanks to these, structures can be classified as "permeable", if the material manages to pass a considerable amount of fluid, and otherwise it is called "impermeable" to any structure through which the passage of a fluid is impossible, that is,, the passage of a fluid through a structure is impossible or does not occur, as an example it can be noted that these materials are widely used to create clothing or garments that protect from the rain, thanks to their previously mentioned properties.
The ability of a material to be permeable or its permeability can be modified, since it is affected or distorted by three important factors which are: the porosity of the material, the more porous it is, that is, the larger the the number of small holes it has, the more serious the ability to be traversed by some liquid compoundwhich is the same as saying it will be more permeable, on the other hand, the density of the fluid that would pass through the material is found, the denser the liquid, the less permeable the material in question, it should be noted that the fluidity can be modified with the temperature that it has; Finally, the third factor that modifies the permeability of a material is the pressure possessed by the fluid that passes through the structure, this will modify the density in the opposite way, that is, the more pressure is applied, the permeability will increase.
