Q:

What are the properties of air?

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Quick Answer

Air is matter that has weight and contains 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of argon, carbon dioxide and other ingredients.

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Full Answer

Air is a mixture of gases, which is why it has weight. Gases are a composition of several molecules that remain in constant motion. It occupies volume in space, but how much space it takes up depends on its temperature. Normally, gases at a higher temperature take up more space.

Air's density varies in different parts of the atmosphere. At the edge of space, its density is zero. Air density, temperature and pressure can change several times per day and varies from region to region.

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Related Questions

  • Q:

    What are the components of air?

    A:

    While the composition of dry air differs slightly from place to place, it is generally made up of about 78 percent nitrogen and 21 percent oxygen. Argon makes up most of the remaining 1 percent, and carbon dioxide and other trace elements make up the rest.

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  • Q:

    What is the chemical makeup of the air people breathe?

    A:

    The air that people breathe is almost identical to atmospheric air, consisting of about 78 percent nitrogen and 21 percent oxygen. The last 1 percent of air composition is made of several different gases like argon, helium, carbon dioxide, methane, hydrogen and water vapor.

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  • Q:

    Is air a compound?

    A:

    Air is a mixture, not a compound. Scientists define a mixture as a heterogeneous blend of molecules and atoms in variable proportions, while a compound is a substance formed by the chemical combination of two or more elements in fixed proportions.

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  • Q:

    How does air move at the poles?

    A:

    Air at either pole moves in large-scale and persistent cyclones called the polar vortices. These vortices extend from the mid and upper-level troposphere in to the stratosphere. They enclose the polar highs, the regions of high atmospheric pressure around either pole, and lie in the wake of the polar fronts.

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