Final answer:
The body composition assessment that is done in water is called hydrostatic weighing. Hydrostatic weighing involves weighing a person outside the water and then weighing them again while completely submerged to calculate the percentage of body fat.
Step-by-step explanation:
The body composition assessment that is done in water is called hydrostatic weighing.
Hydrostatic weighing, also known as underwater weighing, involves weighing a person outside the water and then weighing them again while completely submerged. Since bone and muscle weigh more than water, a person with higher bone and muscle mass will weigh more when in water compared to someone with less bone and muscle mass. By measuring the difference in weight, the percentage of body fat can be calculated.