What is the role of activated charcoal in gas mask used in coal mines?

Explanation

**Step-by-Step Solution:**

1. **Understanding Adsorption**:
- Activated charcoal functions based on the principle of adsorption, which is a surface phenomenon. In adsorption, molecules adhere to the surface of a solid without penetrating its bulk. This is different from absorption, where substances are taken up into the bulk of a material.

2. **Properties of Activated Charcoal**:
- Activated charcoal has a highly porous structure, which provides a large surface area for adsorption. This characteristic allows it to effectively trap various gases and impurities.

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