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19. Bomb calarimeter
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19. Bomb calarimeter
- The bomb calorimeter is used to detect the calories of food by burning it. The nutrition value of food can be measured on many different scales. The most basic measurement scale is the free energy content of the food. How much energy is released when chemical bonds within the food are broken? The energy content of food is measured in calories, the amount of kinetic energy required to raise the temperature of one ml of water, one degree. Food is burned under controlled conditions, breaking chemical bonds and releasing free energy. The burning is chemically similar to the breakdown of food in cellular respiration although the process occurs much more quickly and in a less controlled fashion during ignition. The calorimeter consists of two vessels: outer vessel and inner vessel. The space between these vessels acts as a heat insulator and hence there is very little heat exchange in between the inner and outer vessels. Thermometer measures the temperature of the liquid in the inner vessel. The stirrer functions such as way to stir the liquid to distribute the heat in the entire vessels. The fibre rings in the calorimeter helps to hold the inner vessel hanging in the centre of the outer vessel.
In the lecture, the speaker talks about bomb calorimeter,
At the beginning of the lecture, the speaker says it is a device can be used to measure the energy contained in the subject
Also, the speaker mentions there are two vessels, outer vessel and inner vessel. The subject will be put in the inner chamber and outer vessel is insulation. The water will be filled in to the space between two vessels.
According to the speaker, when the subject is burning, it releases energy and heats up the water through ignition wire.
Lastly, the speaker indicates that by measuring the water temperature with thermometer, we can calculate the energy of the subject.
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- Retell lecture PTE Mind Map on 19. Bomb calarimeter, created by Trang Pham on 13/02/2018.
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- Trang Pham
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