Definition:Density (Physics)/Area

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The area density of a two-dimensional body is its mass per unit area.


The usual symbol used to denote area density is $\rho_A$ (Greek letter rho), although some sources simply use $\rho$ if the context makes it clear that it refers to area density rather than volume density.

Occasionally, $\sigma$ (Greek letter sigma) is also used, but this is more commonly used for surface charge density.


The dimension of area density is $\mathsf M \mathsf L^{-2}$: mass per unit area.



$1 \ \mathrm g \ \mathrm{cm}^{-2} = 10 \ \mathrm{kg} \ \mathrm m^{-2}$

Also known as

Also known as surface density, areal density or planar density.

Also see