| Reverse osmosis is a process for desalting water that uses membranes that are permeable to water but essentially impermeable to salt. |
| This does not happen, however, because the cell membrane itself is impermeable to ions like sodium and potassium. |
| Piping is favoured by high infiltration rates, pre-existing cracks and voids, an impermeable sub-layer, steep gradients, and erodible materials. |
| Rigid and impermeable boundaries maintain and protect our disconnection from others. |
| The nexine is an ultrafilter membrane, which is impermeable to most proteins. |
| The primary pipe is a flexible annularly corrugated pipe made from stainless steel which is flexible and nearly impermeable to fuels. |
