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Chapter 9: Problem 26

Cake mixes and other packaged foods that require cooking often contain special directions for use at high elevations. Typically these directions indicate that the food should be cooked longer above 5000 ft. Explain why it takes longer to cook something at higher elevations.

Short Answer

Expert verified
In short, cooking at higher elevations takes longer because the air pressure is lower, resulting in a decreased boiling point of water. This lower boiling point means that chemical reactions involved in cooking processes, like breaking down proteins and starches, take longer to occur. To account for this, cake mixes and packaged foods often include special cooking instructions for high elevations, such as increasing cooking times or adjusting ingredient amounts.

Step by step solution

01

Air Pressure and Elevation

At higher elevations, the air pressure is lower than at sea level. This is because there are fewer air molecules found at higher altitudes, which results in less pressure exerted on objects. This decrease in air pressure affects the way food cooks, specifically when it comes to boiling or steaming foods.
02

Boiling Point of Water and Elevation

The boiling point of water decreases as air pressure decreases. So, at a higher elevation with lower air pressure, the boiling point of water is lower than at sea level. For example, at sea level, the boiling point of water is 100掳C (212掳F). However, at 5000 feet, the boiling point of water decreases to around 93掳C (199.4掳F). This means that water will boil at a lower temperature, which can impact the cooking process.
03

Effect on Cooking Time

Since water boils at a lower temperature at higher elevations, it takes longer for food to cook. This is because many chemical reactions that occur during cooking, such as those that break down proteins and starches, require a specific temperature to take place efficiently. With a lower boiling point at higher elevations, these reactions can take longer to happen, which increases the overall cooking time of the dish.
04

Special Cooking Directions

To accommodate for the longer cooking times required at higher elevations, cake mixes and other packaged foods often include special high-elevation cooking instructions. These directions may suggest increased cooking times, adjusting the oven temperature, or making ingredient changes like adding more liquid or using less leavening agents in the recipe. In conclusion, it takes longer to cook something at a higher elevation because the lower air pressure causes the boiling point of water to decrease, leading to longer cooking times for various chemical reactions to take place. Following the special high-elevation directions provided on food packages can help ensure successful cooking results in these situations.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Air Pressure and Boiling Point
At higher elevations, the air pressure is significantly lower compared to sea level.
This variation occurs because fewer air molecules are present at these elevated altitudes. The consequence of reduced air pressure is a decrease in the boiling point of water, which can notably affect cooking processes.
The boiling point is the temperature where a liquid turns into a gas. Normally, at sea level, water boils at 100掳C (212掳F). However, this changes with altitude. For instance, at an elevation of 5000 feet, water boils at about 93掳C (199.4掳F).
The lowered boiling point means that water begins to boil at a cooler temperature compared to lower elevations. This shift in boiling point means that cooking methods reliant on boiling or steaming may require adjustments to achieve the same results that they would near sea level.
Elevation and Cooking Times
Cooking at high elevations implies longer cooking times, and this phenomenon can be attributed to changes in the boiling point of water.
The lowered boiling point impacts how long it takes for various foods to cook thoroughly. Chemical reactions essential to cooking, such as the gelatinization of starches and denaturation of proteins, necessitate certain temperatures to occur effectively.
  • At higher altitudes, because water boils at a lower temperature, these reactions proceed more slowly, extending the time necessary to cook foods completely.
  • Additionally, evaporation rates are quicker, potentially requiring adjustments, such as adding more liquid to recipes.
To put it simply, since the same amount of heat is provided over a longer period, cooking times invariably increase the higher you go.
High-elevation Cooking Instructions
When cooking at high elevations, special instructions on food packaging can be immensely beneficial.
These instructions cater to the adjustments needed to counter the effects of lower air pressure and altered boiling points. These adaptations might include:
  • Increasing the cooking time to ensure food reaches the desired texture and taste.
  • Adjusting oven temperatures to compensate for reduced air pressure.
  • Making ingredient changes, such as adding more liquids to counteract rapid evaporation or using less leavening agent to prevent over-rising.
By closely following these specialized instructions, you can achieve successful cooking outcomes even at significant altitudes, ensuring your meals are both delicious and cooked to perfection.

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