No, but there are workarounds, depending on what you want to do. For example, you can table density, but not directly.
Create the following relation:
weight1=density1*mp_volume()
weight2=density2*mp_volume()
(substitue the numeric values for density1, etc.)
This will create parameters, weight1 & weight2 by muliplying the density value by the volume. These parameters can then be added to the family table.