The packing arrangement of a powder/granules bed depends on the nature and extent of friction among the particles/granules. The bulk volume of prills depends on packing arrangement of particles, and the packing arrangement in turn depends on inter-particular or inter-granular friction orin other words, bulk volume of a given granules depends on the inter-particular friction. Angle of repose, bulk density, particle distribution are other important parameters for this estimation.Solids have different characteristics to liquids and there are a few things that need to be considered. This Technical Note outlines the most important areas for consideration when measuring solids piles.