Passage Hydrostatic Weighing Is a Technique Used to Determine an Individual's

Passage
Hydrostatic weighing is a technique used to determine an individual's overall body density.  The weight of the individual is measured when their body is completely submerged in water.  Because the volume of air in the respiratory system affects the measured underwater weight, the individual must exhale completely before entering the water.  However, residual volume, the volume of air that always remains in the respiratory system, must also be accounted for.By comparing an individual's in-air weight to their underwater weight, their total body volume can be determined.  The density of the body D_b excluding any air in the respiratory system is calculated with the in-air mass of the individual m_air, the individual's total body volume V_total, and an estimate of residual volume V_res by:
Db=mairVtotal-VresEquation 1Body density can be used to calculate an individual's body fat composition, the percentage of total body mass that is made up of fatty tissue.  Human fatty tissue has an average density of 0.9 kg/L, and the density of water is 1 kg/L.  The acceleration due to gravity is 10 m/s².
Adapted from Siri, WE, Body composition from fluids spaces and density. Nutrition 1956 Springer Nature.
- The hydrostatic weighing container above is filled with water.  If point A is 0.7 m above the bottom of the container, what is the fluid pressure at point A?  (Note:  The density of water is 1,000 kg/m³.)

A) 7.0 × 10³ N/m²
B) 1.0 × 10⁴ N/m²
C) 1.3 × 10⁴ N/m²
D) 2.0 × 10⁴ N/m²

Correct Answer:

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