Key Words & Terms in Bulk Solid Industry

Dielectric Constant: All materials have a dielectric constant greater than Dry Air (Dk = 1). This term refers to the capacitive properties of a material. Materials such as plastics have a range of 1.2 to 3.0; oils usually range between 2.0 to 3.0; and water (moisture) is usually 40 to 80.

Bulk Density: Weight of the material per volume such as pounds per cubic foot (lb/ft3) or grams per cubic centimeter (g/cc3).

Angle of Repose: This is the angle that material will naturally mound up when filling a tank, or down when discharging a tank.

Hygroscopic: Material will absorb moisture; some examples include starch, flour, fly ash, clays and cement.