Physical Properties Test
where ρ is density, m is mass, v is volume, ρw is the density of water, Wreal is real weight of the sample and Wsub is submerged weight of the sample.
Porosity or void fraction is a measure of the void spaces in a material, and is a fraction of the volume of voids over the total volume, between 0 and 1, or as a percentage between 0% and 100%. Strictly speaking, some tests measure the “accessible void”, the total amount of void space accessible from the surface. Porosity is defined by the ratio:
where VV is volume of void-space (such as fluids), VT is total or bulk volume of the material, including the solid and void components, ρ is density of the sample, ρw is density of water, Wsat is saturated weight and Wreal is real weight of the sample.