![]() However, the density of every matter (solids, liquids, gases) depends, stronger or weaker, not only on the chemical composition of the substance but also on the external conditions like pressure and temperature.īecause of these dependencies and the fact that the Earth's atmosphere contains various gases (mostly nitrogen, oxygen, argon and water vapor) the air density definition needs to be further expanded. We can express it with the following density of air formula:įrom the above equation, you may suspect that the density of air is a constant value that describes a certain gas property. It tells us how much does a certain volume of air weigh. The basic definition of air density is very similar to the general definition of density.
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