Membranes which allow a solvent to pass freely but are impervious to a solute when dissolved in that solvent.
Their mother and the regent's, her father's former mistress, was herself not impervious to her prisoner's lifelong power of seduction and subjugation.
Plant houses must be as far as possible impervious to wet and cold air from the exterior, provision at the same time being made for ventilation, while the escape of warm air from the interior must also be under control.
These prairies are traversed by ridges, which facilitate irrigation, and are underlaid by an impervious subsoil, which facilitates both effective storage and drainage.
Similarly it is necessary, in view of the hydrostatical relations of water and mineral oils, and the volatile character of the latter, that the porous stratum should be protected from water and air by an overlying shale or other impervious deposit.
The bed of fire-clay under a coal seam, being impervious to water, frequently determines the horizon of numerous springs issuing from the hillsides.
Black ironwood is likewise used in building wagons, while sneezewood is largely utilized for supports for piers and other marine structures, being impervious to the attacks of the Teredo navalis.
The main requisites for a productive oil or gas field are a porous reservoir and an impervious cover.
They are impervious to water and gases.
I began to occupy my house on the 4th of July, as soon as it was boarded and roofed, for the boards were carefully feather-edged and lapped, so that it was perfectly impervious to rain, but before boarding I laid the foundation of a chimney at one end, bringing two cartloads of stones up the hill from the pond in my arms.