Common sense told people in the Middle Ages that the earth was flat. Science demonstrates the reality. Few of us can even disturb the air as matter. The fresh air seems anything until we go without at least. We know that air is a real phenomenon and not just an empty space so we can play. A simple balloon experiment showed us that even the air has weight. Need more fresh air, much more spoiled air.When first taught us to breathe the air, we soon learned that the air contains oxygen, which is responsible. In years later, we have a little more detail about the composition of air. There is nitrogen in the air and a significant percentage. Air contains about 21% oxygen, nitrogen and 78% less than one percent of the gases to be detected. He later discovered that this aid is the composition of dry air. Gas is important to note that air samples can vary due to the presence of pollutants, natural particles or the nature of the atmosphere at a location.Air reality is colorless, odorless gas that is in its normal state. The components of air can be assumed that the liquid form, but the conditions are not present in the atmosphere of the earth. Trace gases are an important component. There are many gases that are fundamental to climate change processes. This is surprising, since only trace gases is approximately 0.93% of dry air. The volume of each element is measured in parts per million by volume or ppmv.Trace elements argon, hydrogen, carbon dioxide, neon, helium, krypton and methane and hydrogen. Small elements including nitrous oxide, xenon, ozone, nitrogen dioxide and iodine. The large number of elements of 0.93% dry air and filtering is really incredible. The composition of air is in a delicate balance. The negative environmental impacts of some human activities serve the balance is disturbed by the introduction of pollutants into the air and increasing the proportion of trace elements (such as carbon dioxide) into the atmosphere consists primarily of proportions.Dry harmful gases. Water vapor is present in varying degrees in normal air samples (between 1% and 4%). This will affect weather conditions such as humidity and precipitation. Dust particles are also present, especially near the surface. In time, you can hear the Saharan dust is on the list. This mass of particles that travel hundreds of miles across the Atlantic Ocean through the air as his address. Some air samples may also be natural substances such as spores, pollen, sea water and industrial components pollutants.The Air are subject to the laws of gravity, except for light gases can escape Earth's atmosphere. The air we are most familiar with is the troposphere is located near the surface of the earth. Air at different levels of variable atmospheric density, pressure and composition. Beyond the troposphere, stratosphere, mesosphere and ionosphere. Even at higher altitudes in the troposphere, decreases oxygen levels. This is not even all that can be said on the air and its components, but it is a good base.