Air is the invisible mixture of gases that surrounds the Earth. Air contains important substances, such as oxygen and nitrogen, that most species need to survive. Human beings, of course, are one of those species. Sometimes, the word "atmosphere" is used instead of the word "air." Standard Dry Air is the composition of gases that make up air at sea level. It is a standard scientific unit of measurement. Standard Dry Air is made up of nitrogen, oxygen, argon, carbon dioxide, neon, helium, krypton, hydrogen, and xenon. It does not include water vapor because the amount of vapor changes based on humidity and temperature. Because air masses are constantly moving, Standard Dry Air is not accurate everywhere at once. Nitrogen and oxygen make up about 99 percent of Earth’s air. People and other animals need oxygen to live. Carbon dioxide, a gas that plants depend on, makes up less than .04 percent. Plants and animals each produce the gases that the other needs to live. Plants need carbon dioxide—people and other animals exhale carbon dioxide as a waste product. People and other animals need oxygen—plants produce oxygen during an important process called photosynthesis, which turns the sun’s energy into nutrients. Water vapor in the air is sometimes visible as clouds. Water enters the atmosphere through the water cycle. The water cycle also brings molecules in the air into oceans, lakes, and rivers. Some gases in the air come from volcanic eruptions. Volcanic eruptions eject gases from the interior of the Earth. The most common gas emitted by volcanoes is water vapor. Other gases, such as carbon monoxide and sulfur dioxide, are toxic to most organisms. A few organisms, however, thrive on these gases. At the bottom of the ocean are bacteria that do not need oxygen or sunlight to survive. In other words, they do not need air. These strange organisms create their own nutrients using hydrogen sulfide, not carbon dioxide. The hydrogen sulfide comes from cracks, or vents, in the Earth’s crust.
High in the stratosphere, a layer of the Earth’s atmosphere, is a special air molecule called ozone. Ozone is made up of three atoms of oxygen. The massive collection of these molecules is called the ozone layer. The ozone layer blocks harmful ultraviolet, or UV, rays so the sun’s powerful radiation does less damage to living things on Earth. Unfortunately, air pollution has a negative effect on the air we breathe. Air pollution happens when harmful byproducts, like exhaust from cars, enter the air. These pollutants can clog the atmosphere with smog, a combination of smoke and fog. They can also create toxic clouds of dust. Other air pollutants, such as methane and excess amounts of carbon dioxide, can upset the balance of molecules in the air, contributing to global warming. Non-Atmospheric Air Compressed air is air kept at a consistent pressure, such as air pressure at sea level. Airplanes are usually pressurized at ground level so passengers can breathe without canisters of air. Often, compressed air is kept at a pressure higher than normal air pressure. Scuba divers use compressed air to breathe under water. The canisters of air allow divers to inhale through a tube and exhale into the water. Pneumatics is the science and work of pressurized air and other gases. The uses for pneumatics are far-ranging. Air brakes in automobiles, trucks, and trains use compressed air to slow wheel rotation and stop the vehicles. Pipe organs use compressed air at different pressures to create different musical notes.
Lorem ipsum dolor sit amet, consectetur adipiscing elit.Morbi adipiscing gravdio, sit amet suscipit risus ultrices eu.Fusce viverra neque at purus laoreet consequa.Vivamus vulputate posuere nisl quis consequat. Air is made up of different gases, such as oxygen, nitrogen, and carbon dioxide.Which statement best describes these three components of air?They are all classified as pure substances.They cannot react with another substance.They are chemically bonded to one another.They can be classified as elements. The mixture of gases that makes up the Earth’s atmosphere is known as air. Nitrogen makes up 78 % of this gas, which is mixed with oxygen (21%), water vapour (variable), argon (0.9 %), carbon dioxide (0.04%), and trace gases. There is no apparent scent or colour in pure air. Dust, pollen, and spores are common contaminants in the air; additional contaminants are referred to as “air pollution.” Because there is no air in space, the so-called air on another planet, such as Mars, would have a different composition. We all know that air surrounds us everywhere on this planet. One cannot imagine the existence of life without air. Ever wondered what is air made up of? Is it a mixture or a pure substance? In ancient times, the air was thought to be a pure substance but was later found to be a mixture of many gases. The composition of air is not constant and changes from place to place. For example: in polluted areas, since emissions of carbon dioxide are very high therefore, they have the higher percentage of carbon dioxide. The main components of air are explained below: Water vapour: We know that water present in oceans and rivers evaporates during summer and escapes into the air. Thus water vapour is one of the components of the air. It occupies very less percentage of the earth’s atmosphere. Oxygen: Have you ever tried to burn a candle in absence of air? If you would try you would notice that it doesn’t burn in absence of air. Air contains some matter which supports combustion. This substance is oxygen. Oxygen is one of the major components of air around us. Air comprises almost 21% oxygen. Nitrogen: When you blow over a burning candle you notice that it extinguishes. This means air contains incombustible gases (gases which don’t support combustion) too. This is majorly due to the presence of nitrogen. Nitrogen occupies nearly 78% of the earth’s atmosphere and is the most abundant gas on our planet. Carbon dioxide: Carbon dioxide is mainly produced due to respiration by plants and animals or the burning of fuel. It occupies 0.038% of the earth’s atmosphere. Its occupancy keeps on changing from one place to another in our atmosphere. Smoke and dust particles: Smoke is present in our atmosphere due to the burning of fuels. Its occupancy varies from place to place. It is a mixture of gases and is often harmful. Apart from these, dust particles are also present in our atmosphere which we observe when we see a ray of light in a dark room. Smoke and dust particles occupy less than 1% of earth’s atmosphere. 
Air is a mixture of a number of different gases. Nitrogen, oxygen, which is essential for animals and humans’ survival, carbon dioxide, water vapour, and trace amounts of other elements make up the atmosphere (argon, neon, etc.).
Air is a solution as well: it’s a homogeneous mixture of gaseous nitrogen solvent and oxygen, as well as smaller amounts of other gaseous solutes.
Air can be found almost everywhere on the planet, except where there is water. Air can even be found in the earth’s surface layer, in the soil. Air is found not just on Earth, but also in the atmosphere, which is a layer of air that surrounds the planet. Depending on temperature and height, the atmosphere can be separated into layers. Straight borders do not clearly distinguish these lines; they eventually overflow one another.
The force that air exerts on objects is known as air pressure. As a result of the earth’s magnetic attraction force, all air in the atmosphere presses against it. Every item and life form on Earth, including tables, roofs, and houses, as well as humans, animals, and plants, is subjected to air pressure.
The term “wind” refers to air that is moving. The air moves as a result of many sorts of air pressure on the surface of the earth. Wind direction and force can be extremely variable. Cardinal points are a term used to describe wind force. To learn more about different components of air download BYJU’S the learning app.
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Which statement best describes these three components of air
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