What is porosity and permeability in geology?

Porosity is a measure of how much of a rock is open space. This space can be between grains or within cracks or cavities of the rock. Permeability is a measure of the ease with which a fluid (water in this case) can move through a porous rock.Click to see full answer. Keeping this in view, what is porosity in geology?Porosity is the percentage of void space in a rock. It is defined as the ratio of the volume of the voids or pore space divided by the total volume. It is written as either a decimal fraction between 0 and 1 or as a percentage. For most rocks, porosity varies from less than 1% to 40%.Secondly, what is the major difference between porosity and permeability? Porosity is a measure of how much empty space (individual pore spaces are often very tiny) is present between the particles in a rock. Permeability is an evaluation of whether or not – and how much – of those empty spaces are connected to each other. Just so, what does permeability mean in geology? Permeability is the property of rocks that is an indication of the ability for fluids (gas or liquid) to flow through rocks. High permeability will allow fluids to move rapidly through rocks. Permeability is affected by the pressure in a rock.How are porosity and permeability related to groundwater?Porosity is a description of how much space there could be to hold water under the ground, and permeability describes how those pores are shaped and interconnected. This determines how easy it is for water to flow from one pore to the next.

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