FAQ air chemistry and physics Frequently Asked Questions
The question library on air related issues
What is air?
Air is nothing but a mixture of a variety of gasses. The air in the atmosphere consists of nitrogen, oxygen, which is the life-sustaining substance for animals and humans, carbon dioxide, water vapour and small amounts of other elements (argon, neon, etc.). Higher in the atmosphere air also contains ozone, helium and hydrogen. People can only clearly notice the prescence of air when the wind blows.
What does air consist of?
The air we breathe consists mostly of the following gases:
The amount of water in the air greatly varies. When large amounts of water are present in the air other elements are present in lower amounts. The amount of water in the air can rise up to 4%. The lowest percentage of water in the air is 0,5%. Water presses present gases closer together, so that it can take up enough space.
What are gases?
All chemical elements can be found in several different states (phases). One of these phases is the gaseous phase. Apart from gaseous an element can also be solid or liquid. Water is called ice when it is solid, it is wet when it is liquid, and when it is gaseous it exists merely as gas or steam.
Where on earth do we find air?
We can state that air can be found everywhere on earth exept where there is water. Air is even located in the surface layer of the earth; in the soil.
What types of air are there?
When a large quantity of air has one identical dampness and temperature, it is rated as one separate type of air. The air type must cover a horizontal area of one thousand kilometres. The height of an air type can vary between one hundred metres to coverage of the entire troposphere.
What is wind?
Wind is basically air that is in motion. The air moves as a consequence of various types of air pressure on earth. Wind direction and wind-force can vary greatly. Wind-force is often referred to as cardinal points.
Simply put, wind exists because solar radiation warms the earth. Heat and hot air rise, causing the air in the atmosphere to start moving. This motion is known as wind. During this motion of air, warm air is transported from the equator to the poles and cold air is transported back to the equator. This effect causes the equator to cool down and the poles to slightly warm up to prevent extreme temperatures. Apart from wind, oceans also aid in spreading heat.
What is air pressure?
Air practises a certain force on objects, called air pressure. All air found in the atmosphere presses itself upon earth as a result of magnetic attraction force of the earth. Air pressure is practised upon each object and life form on earth, such as tables, roofs and houses, but also humans, animal and plants. You will not notice this air pressure, because there is a force inside your body that creates a pressure equally strong on the air around you. Under a table the pressure equals the pressure on the table, otherwise it would directly collapse.
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