[Leejohnston]

## Pressure — Why Depth Matters

### 1. The Equation

Pressure = Force ÷ Area

P = F ÷ A

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### 2. What Each Symbol Means

- P = pressure
- F = force
- A = area

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### 3. What the Equation Is Telling Us

Pressure increases when:
- force increases
- area decreases

This is why sharp objects cut better.

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### 4. Where It Comes From (Intuition)

The same force spread out feels gentle.
Concentrated into a small area, it feels intense.

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### 5. Worked Example

If:
- Force = 100 N
- Area = 0.5 m²

Pressure = 100 ÷ 0.5
= **200 Pa**

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### 6. Real-World Applications

- Deep-sea diving
- Hydraulics
- Weather systems
- Structural engineering

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### 7. Common Misconceptions

- Pressure only comes from weight → false
- Pressure is the same everywhere underwater → false
- Bigger objects always apply more pressure → false

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### Try It Yourself

Why does pressure increase as you dive deeper underwater?