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Ultrasound Mechanical radiant energy that 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.   HOME | Site Map | Center Stage | Our Solutions | Our Satisfied Clients | Fitness Topics PFP Newsletter | Company Profile | Contact Information | Help | Glossary | ?Mark | About the Author | Disclaimer ©Copyright 1999-2003 Apriori, Inc. All Rights Reserved. APRIORIATHLETICS and Progressive Fitness Personality are Service Marks of Apriori, Inc. All products mentioned are trademarks or registered trademarks of their respective owners.