A person living in shimla observed that cooking without using pressure cooker takes more time. The reason for this observation is that at high altitude

Options

A. pressure increases
B. temperature decreases
C. pressure decreases
D. temperature increases

Explanation

**Step-by-Step Solution:**

1. **Understanding the Context**: The question states that a person living in Shimla observes that cooking without a pressure cooker takes more time. This observation is related to the altitude at which Shimla is located.

2. **Effect of Altitude on Pressure**: At higher altitudes, atmospheric pressure decreases. This is a fundamental concept in physics and chemistry, where pressure is inversely related to altitude.

3. **Boiling Point of Water**: The boiling point of water is affected by atmospheric pressure. When the pressure decreases (as it does at high altitudes), the boiling point of water also decreases. This means that water will boil at a lower temperature than the standard 100°C (212°F) at sea level.

4. **Cooking Implications**: Since the boiling point of water is lower at high altitudes, food cooked in water will not reach the same temperature as it would at sea level. As a result, cooking takes longer because the food does not cook as effectively at the lower temperature.

5. **Pressure Cooker Functionality**: A pressure cooker increases the pressure inside the pot. This increased pressure raises the boiling point of water, allowing it to reach higher temperatures. Consequently, food cooks faster in a pressure cooker compared to cooking without one at high altitudes.

6. **Conclusion**: Therefore, the reason cooking without a pressure cooker takes more time at high altitude is that the pressure decreases, leading to a lower boiling point of water.

**Final Answer**: The correct reason for the observation is that at high altitude, the pressure decreases.

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