We are all aware that air surrounds us on our globe. It is impossible to fathom living without air. Is it a mixed material or a pure substance? Air was formerly assumed to be a pure material, but it was subsequently discovered to combine several gases.
Air and its Composition varies from place to location and is not consistent. For example, in polluted areas, where carbon dioxide emissions are exceptionally high, the air includes a more significant proportion of carbon dioxide. The following are the primary components of air:
Air is composed of 78.09 % nitrogen, 20.95 % oxygen, 0.93 % argon, 0.04 % carbon dioxide, and trace quantities of other gases. Water vapour and dust particles are also present in the air in different proportions. Trace gases are present at highly minute levels in the atmosphere.
The dry air molar mass of dry air or air with little or no water vapour is 28.97g/mol. We may calculate the average molar mass of a gas mixture using a simple formula that takes the total of the molar masses of each gaseous component multiplied by its mole fraction.
The Following are the Primary Components of Air:
Nitrogen is the most plentiful and pure component of air, accounting for 78% of the total. Its symbol is the letter N and has the atomic number 7. Nitrogen is created via a process known as nitrogen fixation, which is a continual cycle between living organisms and the environment.
It is also manufactured in industries using fractional distillation of liquid air. Dinitrogen is a molecule composed of two nitrogen atoms linked together by a strong triple bond. Nitrogen is found in living organisms in groupings such as nucleic acids and amino acids. Nitrogen synthesised artificially is also an essential component of fertilisers.
Nitrogen is also used in medicine, with the most common uses being in numerous medications and even antibiotics. Nitrogen is a non-toxic gas, but when released in a confined space, it may displace oxygen, resulting in hypoxia.
The most significant chemical element that makes up air is oxygen. It is denoted by the symbol O and has an atomic number of 8. Oxygen is a highly reactive gas that rapidly forms oxide bonds with other elements. It is also quite flammable (quick to catch fire). After the elements hydrogen and helium, oxygen is the most abundant element in the universe in terms of mass.
Dioxygen is employed in cellular respiration, often known as breathing. Oxygen is required not just for respiration and combustion. Still, it is also a vital component in many other important organic compounds that make up a living creature, such as carbohydrates, proteins, and lipids, including some oxygen.
Oxygen is used not only in the preservation of life but also in leisure activities. Mountaineers ascending to considerably greater elevations need artificial dioxygen in oxygen cylinders. Aside from the use above, oxygen has industrial applications such as the smelting of iron ore into steel. This is a method of removing impurities from molten iron by injecting dioxygen into it.
3. Carbon Dioxide
Carbon dioxide is a gas present in 0.04 % concentration. It has the atomic number 6 and the chemical symbol CO2. Carbon dioxide is created as a byproduct of respiration as well as the breakdown of organic molecules.
It is also created by natural sources such as geysers, volcanoes, and hot springs. It may be found in soft drinks and certain sweets. It is also utilised in the manufacture of fire extinguishers.
Because oxygen is essential for combustion, when we use carbon dioxide to extinguish a fire, it surrounds the flames. It shuts off the supply of oxygen required for combustion, thereby extinguishing the fire. It is also utilised as a refrigerant in transportation and frozen food storage.
Even though the gas carbon dioxide is a trace element, its concentration in the atmosphere is continually growing, resulting in what is known as air pollution. Various human activities, including deforestation, industrialisation, and fossil fuels, cause massive volumes of carbon dioxide to be emitted into the atmosphere.
When breathed in significant numbers, it also causes lung problems. It is a harmful greenhouse gas, which will absorb and emit damaging UV radiation, raising its temperature.
4. Water Vapour
Depending on the temperature, the water vapour in the atmosphere ranges from around 0.01 % to 4.24 %. When we breathe, we also expel some water vapour. Water vapour is produced as a byproduct in many chemical processes.
Like carbon dioxide and methane, water vapour contributes to the greenhouse effect by absorbing and emitting radiation. Water vapour is utilised to create steam, which aids in both cooking and energy production. Because water vapour has a lower density than air, it is sometimes employed as a “lifting gas.”
For example, it is utilised in hot air balloons in the form of steam to increase the vapour pressure above the surrounding environment, allowing the balloon’s shape to be maintained.
The third most abundant element in the atmosphere is argon, and its concentration is 0.93%. It is a noble gas. Its atomic number 18 and the symbol Ar. Naturally, argon is produced due to an isotope of potassium, K-40, and industrially produced by fractional distillation of liquid air.
The application of argon is mainly in the environment where the substances which are normally unreactive become reactive. For example, it is used in graphite furnaces to prevent the combustion of graphite itself.
6. Smoke and Dust Particles
Smoke is prevalent in our atmosphere as a result of the combustion of fossil fuels. Its occupancy varies from location to location. It is a gas combination that is often hazardous.
Apart from them, dust particles may be seen in our atmosphere when we glimpse a light beam in a dark environment. Smoke and dust particles account for less than 1% of the earth’s atmosphere.
The primary elements of air are listed above. Aside from these, there are various gases that contribute to the composition of our atmosphere, such as neon, helium, and sulphur.