The Section Modulus is a geometric property for a given cross-section used in the design of beams or flexural members.
Applicable units are those of quantitykind:SectionModulus
http://en.wikipedia.org/wiki/Section_modulus
The Section Modulus is a geometric property for a given cross-section used in the design of beams or flexural members.
$Z = \frac{I_a}{(r_Q)_{max}}$, where $I_a$ is the second axial moment of area and $(r_Q)_{max}$ is the maximum radial distance of any point in the surface considered from the $Q-axis$ with respect to which $I_a$ is defined.
http://www.iso.org/iso/catalogue_detail?csnumber=31889