Introduction
Food supplies energy for all animals—without it we could not live. The quantity of energy stored in food is of great interest to humans. The energy your body needs for running, talking, and thinking comes from the foods you eat. Not all foods contain the same amount of energy, nor are all foods equally nutritious. An average person should consume a minimum of 2,000 kilocalories per day, which is equivalent to 8,360 kilojoules. Calories and joules are both units of energy. We will use joules in this experiment since it is the accepted SI metric standard.
You can determine energy content of food by burning a portion of it and capturing the heat released in a known amount of water. This technique is called calorimetry. The energy content of the food is the amount of heat produced by the combustion of 1 gram of the food substance. It is measured in kilojoules per gram (kJ/g).
Objectives
- Use a temperature probe to measure temperature changes.
- Monitor the energy given off by food as it burns.
- Determine and compare the energy content of different foods.
Sensors and Equipment
This experiment features the following sensors and equipment. Additional equipment may be required.
Option 1
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This experiment is #16 of Agricultural Science with Vernier. The experiment in the book includes student instructions as well as instructor information for set up, helpful hints, and sample graphs and data.
