6th Grade · Science · Reading Passage · shared by Luke Morgan
This free 6th Grade Science reading passage, "Burning Your Breakfast," explains food energy and how scientists measure it using calorimetry.
Food gives our bodies the energy needed for daily activities like running, playing, and thinking. But how do scientists determine the exact amount of energy packed into a food, such as a walnut? They use a special method called calorimetry to find this out. This process measures the chemical potential energy stored in food by carefully burning a sample in a controlled environment. The amount of heat released directly indicates the food's energy content, showing us how much fuel that food provides for our cells.
The main tool for this measurement is a device called a bomb calorimeter . It is a strong, sealed metal container designed to hold a food sample safely. Inside this sturdy container, a tiny piece of food like a walnut is carefully placed. This container is then submerged into a larger container filled with a known amount of water. A sensitive thermometer accurately measures the water's temperature throughout the experiment, tracking even the smallest changes in heat levels.
Once everything is securely set up, an electric spark ignites the walnut inside the sealed chamber. The walnut then burns rapidly, releasing all its stored chemical energy as heat. Because the inner container is completely sealed, all this heat transfers directly to the surrounding water. No heat escapes into the air, which ensures a very accurate energy measurement. This controlled environment is essential because it prevents outside air from cooling the water down during the test.
As the water absorbs this heat energy, its temperature steadily begins to rise. Scientists carefully record both the starting temperature and the highest temperature the water reaches during the process. The amount the water's temperature increases helps them calculate the total heat released by the burning food…