Final answer:
The density of a human can be determined by how much of their volume is submerged in water when floating, which correlates with their body fat percentage. For instance, a 60.0-kg woman floating with 97.0% of her volume submerged has an average density less than that of fresh water.
Step-by-step explanation:
The density of a human is related to whether they float or sink in a fluid, like water. When discussing a human's density, we often refer to body density as an indicator of a person's percent body fat, which is useful in fields such as medical diagnostics and athletic training. A classic problem in physics is to calculate the average density of a person who is floating. For example, if a 60.0-kg woman floats in freshwater with 97.0% of her volume submerged when her lungs are full of air, it indicates that her average density is slightly less than the fluid density—in this case, freshwater. The ability to float or having a density less than the fluid density can reflect the body fat percentage.