The cognitive approach began to revolutionize psychology in the late 1950âs and early 1960âs, to become the dominant approach (i.e. perspective) in psychology by the late 1970s. Interest in mental processes had been gradually restored through the work of Piaget and Tolman.
poâ¢rosâ¢iâ¢ty. 1. the state or quality of being porous. 2. (in rock or other natural material) the ratio of aggregated pore space to the volume of the entire mass: used as a measure of the amount of fluid, as oil, that a geologic stratum might hold. [1350â1400; Middle English porosytee porÅsitÄs. See porous, -ity ].
In general, porosity is the measure of empty spaces in a material. Any medium that has pores, voids or openings, has a porosity. Since the cuticle layer of the hair strand can open and close to allow the passage of water and other substances into the inner workings of the hair strand, human hair is a porous medium.hen you most likely have low porosity hair. Hair that is really shiny and not exposed to: frequent brushing, heat styling tools, bleach or hair dye, or the harmful UV rays of the sun is also most likely of low porosity.