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We speak and our voice is heard around us by other people. We go up to the mountain by car and our ears block. We stop from time to time at a gas station and check the pressure in our tires. We try to open a new vase of jam and something this is very hard for us as the lid resists opening. We see with surprise in television news, states destroyed from hurricanes. We hear in the weather forecast about low and high barometric and we are wondering on how this will influence the weather and our excursion during the weekend. Finally…
What's going on in this planet? What influences so much our life, enables us to communicate orally, allows us to breathe and therefore to live is called “earth atmosphere”. Tens of billions of molecules, too small to be visible to the eye, mainly molecules of nitrogen (79%) and oxygen (20%), are all around us. During their perpetual constant movement, these molecules strike us as they also strike on all the objects that exist around us. These invisible and perpetually moving particles exist inside a layer of kilometres in height surrounding our planet. Although you may If you have not realized it, we are in the bottom of a “sea” of gas molecules. In the bottom of a “sea” that presses us constantly. How much pressure is exerted by these particles? Is it important? Can we measure it?
Ladies and gentlemen we are welcoming you to the depth of 80 km. Welcome in the “bottom” of planet Earth. Observe the picture and prepare yourself for a game with the air molecules.
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