Usage
The area density is often used to describe the thickness of paper, e.g. 80 g/m2 is very common. It is also an important quantity for the absorption of radiation. When studying bodies falling through air, area density is important because resistance depends on area, and gravitational force is dependent on mass.
Bone density may be measured in grams per square centimetre (g·cm−2).
The body mass index is in terms of area density.
Read more about this topic: Area Density
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—Kenneth G. Wilson (b. 1923)