Introduction It surrounds us on all sides. We breathe air. Admire the endless blue sky and snow-white clouds. And perceive the atmosphere as a natural part of our lives, not particularly thinking of her unit and role in our lives. But some interesting facts begin to draw in as a closer look close to what surrounds you from the moment your rozhdeniya.Sostav atmosphere atmosphere The word derives from the Greek word atmos – pairs and word sphere. It's a whole mass of air surrounding the earth and rotating with it.

In ancient times, people were in the air as a single element. Anaximenes of Miletus in the 6 th century BC, called the air primal, and Empedocles, and Aristotle, one of the four elements of the elements, which contains all the inherent properties of matter. For the first time, the air composition explained the French chemist Lavoisier in the 18 century. He found the complexity of the air, and suggested the name of supporting combustion with oxygen (oxygene), and the stifling of nitrogen, which meant that from the Greek "does not support combustion. Today we know that the composition of the atmosphere is even more complicated.

It is mainly from the 78.1% nitrogen, 21% oxygen and 0.9% argon. In small proportions percent contained as well – carbon dioxide, hydrogen, helium, neon and other gases. Below 20 km in the atmosphere contains water vapor (from 3% in the tropics, up to 2 10-5% in Antarctica). And at a height of 20-25 km is the ozone layer. Shield that protects us from harmful short-wave radiation.