Скачать или смотреть Absorption Phenomena!

This is a simple educational video based on the natural phenomenon of absorption of materials, created by 2 Chemical Engineering students at CCCU. The fundamental principles behind the naturally occurring phenomenon is explained and demonstrated using diagrams, a homemade experiment and relevant examples so people of all ages can understand it.

The video starts by introducing and explaining the scientific definition of absorption, providing a strong basis for the viewer to build knowledge on throughout the rest of the video.

Afterwards, it is shown how this phenomena is apparent in nature, where people can see it happening for themselves in real life and have some personal experience to relate to the topic. The video also mentions a nod to the ‘Carbon Cycle’; an environmental process that involves carbon from the air being absorbed by the sea and is fundamental to our ecosystem.

Next, we cover Nernst Law and the partition coefficient for physical absorption, as apposed to chemical absorption. Nernst Law states that the ratio of the concentration of an absorbant and an absorbent in physical absorption is equal to a constant known as the partition coefficient. Chemical absorption differs as it is driven by the stoichiometric coefficients of each species of the reactions, and their concentrations.

The video then moves on to show some examples and industry uses of absorption, firstly by demonstrating the difference between chemical and physical absorption with the use of silica gel (exhibiting chemical absorption) and kitchen towels that show physical absorption. Secondly, the real-world understanding is reinforced by a simple-to-recreate home experiment involving: a small tub, ruler, some water, test materials and scissors.

To carry out this experiment, measure and cut out equal size strips of your test materials, fill the container to a depth of 1cm of water and proceed to individually dip the strips in the water for 5 seconds and for each strip measure how far the water travels up. The higher the water travels, the more absorbent the material is and if it doesn’t absorb into the material at all, like the case of the plastic strip, it can be deduced that the material is not hygroscopic.

A material must be hygroscopic to exhibit physical absorption otherwise the water has nowhere within the material to be withheld.

The video finishes by explaining different uses of absorption in industry where the keen viewers will be able to deduce chemical absorption as the main use in the chemical process industry. It is used for absorbing parts of gaseous streams when passed over an absorber such as activated carbon. While this is being explained the video shows how silica gel packets work to reduce the humidity in a sealed container such as in the use of new shoes, answering the introduction question.

Thank you for watching.