Which method uses Archimedes' principle to estimate body composition?

Hydrostatic weighing is a method that utilizes Archimedes' principle to estimate body composition by measuring body density. According to Archimedes' principle, an object submerged in fluid experiences an upward buoyant force equal to the weight of the fluid displaced by the object.

In hydrostatic weighing, an individual is weighed both on land and while submerged in water. The difference in weight allows for the calculation of body density, which can then be used to estimate body fat percentage. Since fat is less dense than water and muscle is denser, this method effectively determines the ratio of lean mass to fat mass within the body.

This approach is particularly valuable as it provides a relatively accurate assessment of body composition, relying on the physical properties of water and the distribution of body mass. Other methods listed, such as DEXA, bioelectrical impedance analysis, and skin fold measurements, utilize different principles and technology, but do not specifically rely on Archimedes' principle for their assessments.