The upper and the lower boundaries are closed and impermeable.
This correction factor originated from the description of a very different process, namely the gravity-driven movement of a sphere inside a liquid-filled tube that is closed at its ends and whose wall is impermeable to the liquid (Ladenburg, 1907).
Eyes closed, hands splayed by her side, in a crocheted black bikini, she seemed impermeable to stress.
In addition, plastic or resin components forming an impermeable barrier too close to the body can hold in heat and moisture hereby reducing comfort.
With a very low mudcake permeability, e.g., 10−3 mD, the stresses become very close to those of an impermeable wellbore, implying a lower risk of lost circulation.
Geothermal reservoirs associated with those regions must have a heat source, adequate water recharge, a reservoir with adequate permeability or faults that allow fluids to rise close to the surface, and an impermeable caprock to prevent the escape of the heat.
But look closer and there are cracks in this seemingly impermeable hypocritical arrangement.
Zlokovic et al. [ 33] found, using the BUI method, that the BUI value of glycine was close to that of sucrose, used as a BBB impermeable paracellular marker.
That impermeable anti-missile shield never came even faintly close to making it into our skies.
