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How does a calorimeter measure the energy in food?
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Vegetables are an important part of a balanced diet.
A calorimeter measures the energy in food by determining the amount of heat released when a sample is burned, a process known as oxidation.1
The most common device used for this purpose is the bomb calorimeter. The process works as follows:
- Preparation: A food sample is placed inside a sealed steel vessel called a "bomb," which is then submerged in a bucket of water.2
- Combustion: The sample is ignited, typically using an electric current, causing it to burn completely within the oxygen-rich environment of the bomb.2
- Heat Absorption: The heat generated by the burning food is absorbed by the surrounding water, causing the water's temperature to rise.2
- Calculation: By measuring the precise increase in water temperature and accounting for the heat characteristics of the container and the water, scientists can calculate the total heat energy released by the food.2
While this method provides the total heat of combustion, it is important to note that the human body is not as efficient as a calorimeter; some potential energy is lost during digestion and metabolism.1