What are the properties of air?

Answer

Air has weight, volume, temperature, some water vapor and some velocity. The world is covered with atmosphere that can't be seen. Air in the atmosphere has different colorless gases including nitrogen, oxygen, carbon dioxide, argon and other elements. Gravity is responsible for pulling air to the Earth's surface. This is why air is denser near the ground.

The weight of air varies depending on pressure and temperature. The weight of dry air at zero degrees Celsius under normal atmospheric pressure is 1.293 kilograms per cubic meter, while under one bar of pressure, its weight is 1.275 kilograms per cubic meter. Air is under pressure due to gravity. Air pressure on the ground is much higher than it is near the upper limit of the atmosphere. Air has temperature; it expands when it is hot and contracts when it gets cold. Air occupies space; therefore, it has volume. This is best demonstrated when pumping up a tire.

There is also water vapor in air. Air behaves like a sponge. Hot air can hold more water than cold air. However, if hot air is cooled down, water vapor turns into liquid. Air also has velocity, which is dependent on the strength of the wind.

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