What is the definition of air?

What is the definition of air?

The Air is very important for the life of living things in the world. Day or night, humans, animals and plants need air to breathe. Air cannot be seen with our eyes, but we can feel it.

1. Air Structure

• Air is important to us
• Day and night we need air to breathe
• Day and night animals need air to breathe
• Day and night plants need air to breathe

2. The properties of air

• Air everywhere. Air has weight. Air pressed in all directions
• The moving air is called wind
• Wind blows from areas of high pressure to areas of low pressure
• Where hot air rises, it is replaced by cold air
• At the equator the air is hotter than in other places, at the equator the air rises, replaced by air from a cooler place, there are trade winds

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3. Use of Air

• Air is necessary for combustion
• Air can help human work, for example in windmills, and in vehicles. Air or wind power is used to drive sailboats and drive propellers.

4. Atmosphere

• The earth is covered with a layer of air. This layer is called the atmosphere.
• The higher the layer, the more tenuous. It is not clear where the layer ends. Most of the existing air occupies a layer that is approximately 7-10 km thick.
• The atmosphere protects our earth against objects from outer space that fall to earth. Before reaching the earth, most of these things burn up. Because it rubs against the air.
• The atmosphere also protects the earth from sunlight so that the nights are not too cold and the days are not too hot.

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5. Other Notes Concerning Air.

• Air consists of oxygen and nitrogen.
• Oxygen is a gas required for combustion. Approximately one-fifth of the air consists of oxygen
• At the time of breathing, humans, animals and plants take oxygen from the air. Humans and animals emit a gas called carbon dioxide
• Almost every combustion produces carbon dioxide
• Lime water becomes cloudy, if carbon dioxide flows into it
• Iron rusts when in moist air
• Rusting is caused by oxygen in the air
• Rusting can be avoided by protecting items from moisture
• Oxygen in the air can wreak havoc. Fires are assisted by oxygen in the air
• The fire can be extinguished by blocking the entry of oxygen into the fire
• Balloons can rise into the air because they are filled with gas that is lighter than air
• Aircraft are propelled forward by propeller engines or by jet engines
• Jet engines suck in air from the front. The air is compressed in the combustion chamber and mixed with fuel. The mixture was ignited, expanded and sprayed out with great force backwards. The jet engine is pushed forward.
• Rocket engines work much the same as jet engines. Rocket engines carry their own oxygen, as well as fuel, so they can be used in spaces where there is no air.

Here are some facts about air:

• Air is colorless and odorless
• Air occupies space
• Air is a gaseous object
• The shape and content of the air varies according to the space it occupies
• Air pressed in all directions
• Air provides pressure
• Air flows from where the air pressure is high to where the air pressure is low
• Moving or flowing air has lower pressure than stationary air
• Wind is moving air
• Sea breeze is the wind that blows from the sea to the land
• Air expands when heated
• Hotter air has less pressure than cooler air

When we breathe, we inhale oxygen or acids from the air and emit carbon dioxide or carbonic acid

Air is necessary for combustion

Thus, hopefully useful, as a learning reference. If you have questions about the material above or other materials, please write them in the comments column. Hopefully it will help you learn later. If there is constructive input, please welcome. That is all and thank you.

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