Glossary

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Ultrasound
Mechanical radiant energy that can be used to create images of the human body and also allows estimation of body fat. Ultrasound is also used to treat soft tissue injuries.

Underwater Weighing
By weighing a subject on land and underwater, the body density can be determined using Archimedes Principle. The underwater weight is corrected for residual volume (lungs), gastrointestinal gas. Then percentage body fat is calculated using linear regression equations, such as from Siri or Brozek.

Unstable Equilibrium
An object that when displaced will not return to it previous state.

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