What is "semi permeable membrane"?

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Semi Permeable Membrane:**
A semi permeable membrane (SPM) is a type of membrane that allows certain molecules to pass through while restricting others. The term "semi" indicates that it is partial or selective in its permeability.

2. **Functionality:**
This membrane permits the passage of solvent molecules (like water) but does not allow solute molecules (like salts or sugars) to pass through. This selective permeability is crucial in biological systems and various chemical processes.

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