The relationship between density and porosity is an indirect proportionality.That is, the higher the density of a rock, the lower will be the porosity of that rock.In a more explicit way, the weight of over-lying rocks increase the density of the rock beneath, which in turn decreases the amount of pore spaces (porosity) of the rock through processes such as compaction, cementation, etc. Posted by Nwigwudu Ikechukwu.
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Porosity is measured by taking a sample of the soil. The sample is then tested to measure the speed of water passing through the soil.
A volume fraction of a material that is empty, or without material.
Gravity is a force
The unit weight of submerged soil: Submerged Density (kN/m3) = Saturated Density - Water Density Water Density = 9.81 kN/m3
density of the object < density of the fluid