![]() It is an important concept in geotechnical engineering in the design of certain structural foundations. This can happen over a period of time, resulting in settlement. Geologic materials reduce in volume only when the void spaces are reduced, which expel the liquid or gas from the voids. The void space can be full of liquid or gas. Geologic materials are made up of two portions: solids and voids (or same as porosity). This concept is important for specific storage, when estimating groundwater reserves in confined aquifers. The Earth sciences use compressibility to quantify the ability of a soil or rock to reduce in volume under applied pressure. Accordingly, isothermal compressibility is defined: The specification above is incomplete, because for any object or system the magnitude of the compressibility depends strongly on whether the process is isentropic or isothermal. ![]()
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