A measure type that can represent either mass density (mass per unit volume) or unit weight (force per unit volume). This unified type allows geotechnical data to be reported using either convention. Mass density units include kg/m3, g/cm3, lb/ft3, etc. Unit weight units include kN/m3, pcf (lbf/ft3 as force), etc. The uom attribute specifies which type of measurement is being used.

The unit of measure for density or unit weight. This can be either a mass per volume unit (for true density) or a force per volume unit (for unit weight).