Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: Though not particularly beautiful machines, calorimeters are incredibly useful ones. They are used to determine the calories (food energy) in food, as well as the average heat yield from burning various grades of coal and oil. The price of coal is often dependent on the heat yield from samples burned in a calorimeter. Answer: calorimeter
Output:
What machine is used to determine the calories in food, as well as the average heat yield from burning various grades of coal and oil?