Judging from the noise in the room next door, the Nature Philosophers had completed the work on the porous wall of the airshaft.

The first, and most common, are sintered metal bearings, which have porous walls.

The porous walls draw oil in via capillary action and release the oil when pressure or heat is applied.

Oxygen, required by cells for growth, is fed into the liquid medium through a porous wall in the chamber.

A faint mist came through the tent's porous walls.

But she and other officials said water seeping through the porous wall could have been a factor.

He spent most of his career as a law professor and was the leading scholar advocating a more porous wall between church and state.

And they have been built with porous walls.

Carbon could enter the iron by diffusing in through the porous walls of the crucibles.

Green water bubbled through the porous walls, and the stone was beginning to crack.