> > < do you consider a volume and a solid to be different things?> In the reality yes :)
> You can weigh a solid, not a volume :)

But you can calculate the weight of a volume for a particular material, just with one multiply.

Like you can say "this volume of gold will weigh this much."

But CAD is typically more concerned with the topology and forms that define a shape, not so much with what material is inside of it.

Normally in CAD, a solid means an object that has a defined volume.


- Michael