Selectively Permeable

Science / Biology / Selectively Permeable: Term describing a barrier that allows some chemicals to pass but not others. The cell membrane is such a barrier.

Semipermeable Membrane

Science / Chemistry / Semipermeable Membrane: A membrane that allows some but not all of the components in a mixture to pass through it. Semipermeable membranes are used in dialysis. MORE

Selectively Permeable

Science / Biology / Selectively Permeable: Term describing a barrier that allows some chemicals to pass but not others. The cell membrane is such a barrier. MORE

Permeable

Life Style / Painting / Permeable: Allows another material to pass through without effecting the existing material. MORE

Impermeable Layer

Science / Geology / Impermeable Layer: A layer of rock, sediment or soil that does not allow water to pass through. This could be caused by a lack of pore space or pore spaces that are so small that water molecules have difficulty passing MORE

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