Density

Purpose
To determine the mass(g) of a cubic centimeter(cm³) of a substance.

Principle
Density is calculated from the volume and mass of a substance.
Density = mass/ volume [g/cm³]
For papers, the apparent density may be calculated directly from the gram mage mA (basis weight) and the thickness. The term “apparent density” denotes that measured volume includes voids in the paper:

Apparent density = mA/Thickness (gr/cm3)

Bulk = 1/Apparent density

The reciprocal value of density is called spesific volume(=bulk) of a paper.

If the density of paper is 1.000 g/cm³, this is interpreted as a “single volume” and a density of 0.500 g/cm³ as a “double volume” , etc.