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 ].
Weld porosity is the presence of tiny cavities in a piece of welded metal. Porosity can cause all kinds of problems in your welds, so you want to fix the causes of your porosity before they affect your project. Porosity comes in two varieties. Surface porosity, as youâd guess, occurs on the surface of the metal.