Hello steemians... I have not shared anything with you for a long time. I have been very busy with the university and, unfortunately, I have not had time to draw. 😣
On the other hand, ¡we are already in the rainy season! and thanks to them and the low efficiency of the services in my country, we spent days without electricity or drinking water. Therefore, I have had many difficulties, not only to draw, but also to carry out my work at the university, which, every time is seen more desolate given the great dropout of students, product of the current situation of the country (there's no transportation, cash to pay for tickets, not even food...), which has caused constant stoppages by teachers who work in our alma mater. It is a really sad and frustrating situation for everyone. 😢
Anyway, I have not come to tell you about the terrible situation in my country or university, but I took advantage of this little free time to vent a little. Today I want to share with you some "science". As I mentioned in my presentation a while ago, I'm a Chemical Processes student and I am currently studying a subject related to Water Treatment and everything related to it. The truth is a very interesting subject and I thought it would be a good idea to share with you a little of what I have learned.
So, today I will talk about "The Colors of the Walter"... Since we were little we have been taught that water is colorless, odorless and insipid, meaning that water has no color, smell or taste, so if you ask us if the water has color we will automatically respond: ¡NO! ... But, ¿will this affirmation be true? ¿Why the sea will look bluish or greenish?... ¡These questions will be answered below! 😲
On the basis of the above considerations, it is necessary to understand what white light is and how our eyes perceive colors, in order to understand why water is colored. In this way, it is known that part of the sunlight comes to us in the form of white light (electromagnetic waves), which is composed of almost all the frequencies of the visible spectrum, that is, by all the colors of the rainbow (violets, blue, green, yellow, orange and red). When white light strikes an object, it normally absorbs only a certain set of colors (or what is the same, of frequencies), and the rest, the colors that it does not absorb, transmit, reflect or scatter. So, depending on how the body absorbs this light, our eyes see a certain color or another.
In the case of water, when light passes through it, it absorbs from the electromagnetic spectrum the radiation corresponding to red light, and therefore, the light that passes through it is seen with a blue color (which is the complementary color to the Red). In other words, water absorbs mainly the lower frequencies, which are those associated with red and orange, while blue and green are transmitted entirely or are reflected. Therefore, a beam of light that travels through a large body of water is deprived of part of its red tones, and will be perceived with a blue hue.
In the same way, it is also explained that the greater the volume of water, the more amount of absorption a beam of light has through it, and therefore, it is seen in a more bluish color. For this reason, it can be seen that the deeper the sea, the greater the tonality of blue in the water. This can be verified by filling a glass with sea water, the amount of water contained in the glass will be transparent, if we throw that water back into the sea we will see the blue color again. This is because the absorption of red by water is very weak, so for our eye to be able to perceive it, it is necessary for light to cross a sufficient distance of water.
It should be added that there are factors that affect our perception of tonality or color of water, such is the case of many rivers that have a cloudy appearance, where the brown color predominates, due to the fact that they carry in suspension a large amount of sediments, typically silt. and clays. Likewise, the presence of high concentrations of certain microorganisms can dye the waters of green, white or red colors.
On the other hand, the coloration of the water can vary when being in another physical state, because according to the ideas previously raised, I have spoken about the water in its liquid state. Now, in its solid state (ice), the water is transparent but, as can be seen, the snow has a white coloration. This is because the snow is formed by flakes, small ice crystals of hexagonal shape, that as they are added between them, air is trapped, which disperses the light when absorbed and emitted in all directions, giving it that whitish color that characterizes the snow. Unlike snow, ice does not contain spaces through which the air passes, therefore, it is transparent.
But not even the frozen water is only white, since there are also blue glaciers. The ice of the glaciers has been under enormous pressure for millions of years, that compacted and free of air bubbles ice absorbs better the range of the electromagnetic spectrum, corresponding to the red and yellow tones, thus enhancing the intense blue color that it presents in ice times.
✨ References ✨
Well, it's all for today. I hope to draw something soon and share it with you. Thank you very much for reading my post. If you liked it, I hope you can support me with a comment, suggestion, retest or your valuable vote. It would help me a lot. Without further ado, I say goodbye and wish you a good day.