Air is the most essential part of our planet. Without air, the Earth would be a lifeless planet because the gasses it contains are very vital for plants and animals. Air is a mixture of gasses made up of millions of tiny molecules of gas that move randomly and at high speed. We live, breathe, and move at the bottom of an immense ocean of air called atmosphere.
Air mainly contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, and 0.03% carbon dioxide and many other gasses. carbon dioxide is necessary for plants life because plants absorb carbon dioxide from the air and combined it with water and collected by their roots to form sugars, which helps in their growth. Oxygen is vital for human beings and other animals and they get it from the air to burn food particles in their bodies and produce energy. Every living cell has nitrogen. plants do not take nitrogen from the air, so they get it from the soil. Argon gas is called an inert gas because it is very unreactive. Electric bulbs are filled with argon because it prevents the bulb’s filament from burning up as it would in the air, giving the bulb a much longer life.
Air puts pressure on objects because its moving molecules are always colliding with them. Air pressure is a measure of this force. the open air pressure is called the atmospheric pressure. It is lower at high altitudes where the air is less dense. The barometer is the device that measures atmospheric pressure. this device is very helpful in forecasting weather change because air pressure changes slightly from day to day with the changes in the temperature and humidity of the air.
The air has weight and it has been proved by many experiments. It has many uses like scuba divers use compressed air to breathe undr water, nitrogen is used in explosives and oxygen in medicines. Gasses are extracted from each other by a process known as fractional distillation.