BULK DENSITY APPARATUS
Bulk density is a term not that well known. Most people know the density of a material as the weight per cubic volume in its solid form However, there are many occasions when some materials are handled in a "loose" form, such as powders, granules and flakes. When these materials are in the form of powered, granules and flakes and nestled together, they obviously take up much more volume than when they have been processed into a solid object and this is referred to as the Apparent Bulk Density. The relationship between the solid density and the bulk density is important in a process industry because it gives a good indication of how many parts can be produced from the raw material held in reserve. Measuring the bulk density is very simple and takes just a few seconds. The picture shows a typical system consisting of a funnel and cup. The cup is calibrated to determine its volume and weight. The material is first placed in the funnel which is positioned at a set distance above the cup and with the outlet opening closed off. The outlet is then opened and the material allowed to pour into the cup. Any overfill is scrapped off the top with a ruler. The cup is weighed and the weight of the material found and divided by the volume of the cup.