Area density

From Wikipedia, the free encyclopedia

For computer memory comparisons, see computer storage density. For other meanings, see Density (disambiguation)

The area density of a two-dimensional object is calculated as the mass per unit area. The SI derived unit is: kilogram per square metre (kg m−2).

It can be calculated as:

\rho_A = \frac {M} {A}

or

\rho_A = \rho \cdot l

where

ρA = average area density
M = total mass of the object
A = total area of the object
ρ = average density
l = average thickness of the object

[edit] Usage

The area density is often used to describe the thickness of paper, e.g. 80g/m2 is very common. It is also an important quantity for the absorption of radiation.

Areal velocity. This classical mechanics-related article is a stub. You can help Wikipedia by expanding it.