Explain why cooking is difficult on hills and at high altitudes.

Explanation

### Step-by-Step Solution

1. **Understanding Atmospheric Pressure**: At sea level, the normal atmospheric pressure is about 76 cm of mercury (cmHg). This pressure is what allows water to boil at 100°C (212°F).

2. **Effect of Altitude on Pressure**: As you ascend to higher altitudes, such as hills, the atmospheric pressure decreases. This decrease in pressure affects the boiling point of water.

3. **Boiling Point of Water**: The boiling point of water is the temperature at which its vapor pressure equals the atmospheric pressure. At lower pressures (like those found at high altitudes), water boils at a temperature lower than 100°C. For example, at 2,000 meters above sea level, water might boil at around 93°C (199°F).

...