What is semipermeable membrane?

Explanation

### Step-by-Step Text Solution

1. **Definition of Semipermeable Membrane**: A semipermeable membrane is a thin layer of material that allows certain substances to pass through while blocking others.

2. **Functionality**: This membrane functions based on the size of the particles. It has small pores that permit the passage of small molecules, such as solvent particles, while larger molecules, such as solute particles, cannot pass through.

3. **Driving Force**: The movement of particles across the semipermeable membrane occurs when a driving force is applied. This could be due to differences in concentration, pressure, or temperature.

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