it should be load/area for a shell or membrane. So V = density * thickness * g. You also have to take care of the units. Density[kg/m^3] * g[m/s^2] yields the specific weight [N/m^3] but your other values might be given in kN or mm. The material default component returns actually the specific weight in kN/m^3 despite the chosen output units (bug). So here we are still quite inconsistent as it is rarely needed used in the release version.
In the old version, there is a short documentation in the downloaded folder. It is missing in the current one. I will update this as soon as possible. Documentation_Kiwi3d_BETA050.pdf (763.4 KB)

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