All these factors affect the porosity and permeability of sandy aquifers. Several microscopic variables are analyzed in the GDLS such as&colon; porosity, tortuosity and permeability. Soil texture and structure strongly affect soil porosity and gas diffusion. The chalk had very little porosity, and even less permeability. Graphene aerogels are synthetic materials that exhibit high porosity and low density. Compaction reduces the porosity and the pore sizes. They can differ enormously depending on the combination of electrode porosity, pore size and electrolyte. The structure of the dentinal tubules contributes to both its porosity and its elasticity. This helps improve discrimination between lithology, porosity and fluid effects. This causes abnormal shrinkage in this region, which can lead to porosity and cracks. Controlling annealing temperature is another method of reducing or eliminating porosity. The resulting coating has low porosity and high bond strength. The increased rate is a result of the greater surface area associated with porosity. The paper is microcrepped to give porosity and elasticity. Nitrogen, oxygen and hydrogen are the most encountered gases in cases of gas porosity.