Why do airplanes need to be pressurized for passenger safety when flying high in the atmosphere

Explanation

### Step-by-Step Solution:

1. **Understanding Atmospheric Pressure**:
- At sea level, the atmospheric pressure is relatively high, allowing us to breathe easily. However, as altitude increases, the atmospheric pressure decreases significantly.

2. **Effects of Decreased Pressure**:
- At high altitudes, the lower atmospheric pressure means that there is less oxygen available in the air. This can lead to hypoxia, a condition where the body is deprived of adequate oxygen supply.

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