<strong>Specific surface area</strong> (<strong>SSA</strong>) is a property of solids defined as the total surface area (SA) of a material per unit mass, (with units of m<sup>2</sup>/kg or m<sup>2</sup>/g). It is a physical value that can be used to determine the type and properties of a material (e.g. soil or snow). It has a particular importance for adsorption, heterogeneous catalysis, and reactions on surfaces.
Applicable units are those of quantitykind:SpecificSurfaceArea
https://en.wikipedia.org/wiki/Specific_surface_area
Specific surface area (SSA) is a property of solids defined as the total surface area (SA) of a material per unit mass, (with units of m²/kg or m²/g). It is a physical value that can be used to determine the type and properties of a material (e.g. soil or snow). It has a particular importance for adsorption, heterogeneous catalysis, and reactions on surfaces.
$SSA = \frac{SA}{\m}$, where $SA$ is the surface area of an object and $\m$ is the mass density of the object.