What is the bulk density

The bulk density unit is used in construction to describe the properties of individual building materials. This is the apparent density, the weight-to-weight ratio. Pore, spaces and cavities are also counted. Volume is determined from external dimensions. This physical quantity is dependent on the moisture content of the material. If the pores are filled with air, this is the bulk density of the material in the dry state. If the material has a low porosity, the density and bulk densities are equal.  For a high porosity material, the bulk density in the dry state is always less than its density.