Answer:
The correct answer is - hydrostatic weighing.
Step-by-step explanation:
Hydrostatic weighing or underwater weighing is a technical method of determining or measuring body fat to mass (lean). It is based on the principle of Archimedes of displacement that used in measuring the density of the body of a person.
Hydrodensitometer is the other name of this method which is used to measure the density of a living person by this method.
Thus, the correct answer is - hydrostatic weighing.