Nutritionists commonly use the dietary Calorie (capital C) to measure food energy. According to the source, how does one dietary Calorie relate to the calorie used in chemistry?
AIt equals one hundred chemistry calories
BIt equals one tenth of a chemistry calorie
CIt is unrelated to the chemistry calorie
DIt equals one kilocalorie for the chemist
Answer & Solution
Correct answer: D. It equals one kilocalorie for the chemist
1. The chemistry calorie is defined as the energy needed to raise one gram of water by one degree Celsius.
2. The dietary Calorie is defined as the energy needed to raise one kilogram of water by one degree Celsius, a thousand times more water.
3. This relationship is stated directly: one dietary Calorie equals one kilocalorie for the chemist.
4. It is not a factor of 100 or a tenth, and the two units are directly related rather than unrelated, ruling out options A, B and C.
_Source: OpenStax College Physics (CC BY 4.0), Ch 15 "Thermodynamics", section 15.1 The First Law of Thermodynamics_
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