See how the nutritional value of a nut is measured in a video experiment. Enter the test data into a table, make calculations, answer the questions.
Therefore, in order to measure the nutritional value of a food sample, it must be burned and the energy released during burning must be measured.
Such an experiment is technically quite complex.
Let's watch a video of a very simple and very imprecise experiment.
Test data
| Measurement | Example 1 | Example 2 |
| What food? | ||
| The mass of the empty cup | ||
| The mass of the cup with water | ||
| Initial water temperature | ||
| Final water temperature | ||
| The mass of the food sample with the holder at the beginning of the test | ||
| Mass of the food sample with the holder at the end of the test |
Calculations
| Mass of water | ||
| of water | ||
| Reduction in food weight | ||
| The energy () that heated the water | ||
| Nutritional value of food () |
The left side of the figure shows the device we will assemble to do this job. On the right is an industrially produced calorimeter for precise experiments. Compare the two devices. What do they have in common? How do you think these differences affect the outcome of our experiment?