define permeable and impermeable
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A membrane can be fully permeable, selectively permeable or impermeable. These terms represent the property of membrane to allow the passage of substances like ions across it.
Fully permeable : The membranes which allow the passage of all substances without any hindrance across it are referred as fully permeable membranes.
Selectively permeable : The membranes which allow the passage of only few selective substances across it are referred as selectively permeable membranes.
Impermeable : The membranes which don't allow the movement of substances across it are termed as impermeable.
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