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Water, silly questions (Part 2)

by Γιάννης Μπουζάνας
Water, silly questions (Part 2)

We learned about when we are thirsty, what happens after all with the cold shower, we were shocked by the water that is eaten and yet we did not cover many questions. There are so many others and even more are raised every day, such as, why does the glass sweat, why does the water bubble when it comes out of the bottle since it does not contain carbonate? These and much more you will discover below.

Let's start with the basics. Why does water make bubbles? It is a reasonable question we may all have had, but no one bothered to ask why because we find it a bit "stupid". As silly as it may seem, it is just the opposite. We all know that an airtight bottle has vacuum inside, and when we open it, the air enters with pressure. This is because the air has pressure and because of this, it tends to fill the gap. The bubbles in the water are also created due to this phenomenon. More simply, when we tilt a bottle to pour water in a glass, water comes out from half of the mouth and from the other half air enters. In this way, a vacuum is created inside, while the outside air, due to the pressure it has, tends to penetrate in order to fill it. When water comes out from the whole of the mouth again, then bubbles form, as air enters it again. Every time air enters the bottle, it causes a disturbance in the water, thus creating this phenomenon.

Let's move on to the next question. In the end, not only people but also glasses sweat. How many times have you made coffee yourself, the classic Greek frappe, putting water from the special water filter that you have placed in your tap, coffee, sugar, shaking, ice cubes, water again, and you think that this time the glass on the outside won't be covered with liquids, but before you sit on the couch, the glass is already dripping? Several! The very smart ones, including myself, think it is because of the ice cubes. Wrong. But again, where did this water come from? The answer lies in the laws of Physics and Chemistry. The humidity on the outside of the glass is due to the difference in temperature with that of the environment.

Therefore, the warmer air liquefies as soon as it touches the icy glass due to a temperature difference. So we have the feeling that the glass is "sweating". In a word, this phenomenon is called condensation. Condensation, as a phenomenon, is one of the changes in the phases of the form of matter, which in fact indicates an increased density of it. There are two different types, liquefaction and deposition. We have liquefaction when the gas is converted to liquid and deposition when the gas is converted to solid. Therefore, the sweaty glass phenomenon is a classic case of condensation and more specifically liquefaction of air vapor in water.
After all, this also happens in the water cycle with the creation of rain. Therefore, all this water does not come from inside the glass, as some people think, but it is basically liquefied air.
It seams that, for everything that happens around us, from the simplest to the most complex, Physics always has a good explanation.
Water is a difficult case, so it is good to have the right water filter. Follow this link to see the various water filters we have https://www.primato.gr/products/water-filters/

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George Margiolos

George Margiolos was born in Thessaloniki and has graduated from the Department of Marketing of the Alexandreio Technological Educational Institute of Thessaloniki. He is fluent in English and (not so fluent) in German.

Ηe has been Project Manager at Avery Dennison - Fastener Division in the UK. There, his main project was to redesign the company's products into new applications so as to become more environmentally friendly. In combination with the fact that in the UK people are more familiar with water filters, he has developed a love for environmentally friendly water filters, which reduce the use of plastic bottles and improving people's quality of life.

Since 2008, he has published over 300 unique educational and informative articles on water filters and new water treatment technologies.

Occasionally, universities and doctoral students request to use George Margiolos' articles in their research because of their quality and uniqueness.