Why is silica gel used as a dehumidizer?

Explanation

### Step-by-Step Solution:

1. **Understanding the Role of a Dehumidizer**:
- A dehumidizer is a device or substance that removes moisture from the air. This is important to prevent damage to products that can be affected by humidity, such as electronics, food, and documents.

2. **Introduction to Silica Gel**:
- Silica gel is a granular form of silicon dioxide (SiO2) that is commonly used as a desiccant. It is often found in small packets labeled "Do Not Eat" that come with various products.

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