Semipermeable Membrane

Last Updated: December 23, 2016

Definition - What does Semipermeable Membrane mean?

A semipermeable membrane is any biological or synthetic membrane that allows certain molecules or ions to pass through while restricting others. A semipermeable membrane has spaces between the solid portions of its structure that enable certain substances or molecules to pass through, but are designed to restrict others that are of a larger size.

MaximumYield explains Semipermeable Membrane

A semipermeable membrane is not to be confused with a selectively permeable membrane. A semipermeable membrane allows molecules of a certain size to pass through, whereas the selectively permeable membrane actually “chooses” what can pass through.

The rate of molecular flow through the membrane can depend upon pressure, the size of the molecule, or the temperature.

Landscape weed fabric is considered a semipermeable membrane, as it allows water to pass through but prevents seeds or plant shoots or sprouts from passing.

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