Give an example of sorption.

Explanation

**Step-by-Step Solution:**

1. **Understanding Sorption**: Sorption is a combined process of adsorption and absorption. Adsorption refers to the process where molecules adhere to a surface, while absorption involves the uptake of molecules into the bulk of a material.

2. **Identifying an Example**: A common example of sorption is the interaction between ink and cotton. In this scenario, we consider cotton as the surface and ink as the substance being sorbed.

3. **Describing the Process**:
- **Adsorption**: When ink is applied to cotton, some ink molecules adhere to the surface of the cotton fibers due to weak Van der Waals forces. This is the adsorption part of sorption.
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