Skip to main content

Body Physics: Motion to Metabolism: Body Volume by Displacement

Body Physics: Motion to Metabolism
Body Volume by Displacement
    • Notifications
    • Privacy
  • Project HomeThe Social World of Health Professionals
  • Projects
  • Learn more about Manifold

Notes

Show the following:

  • Annotations
  • Resources
Search within:

Adjust appearance:

  • font
    Font style
  • color scheme
  • Margins
table of contents
  1. Cover
  2. Title Page
  3. Copyright
  4. Dedication
  5. Table Of Contents
  6. Why Use Body Physics?
  7. When to use Body Physics
  8. How to use Body Physics
  9. Tasks Remaining and Coming Improvements
  10. Who Created Body Physics?
  11. Unit 1: Purpose and Preparation
    1. The Body's Purpose
    2. The Purpose of This Texbook
    3. Prepare to Overcome Barriers
    4. Prepare to Struggle
    5. Prepare Your Expectations
    6. Prepare Your Strategy
    7. Prepare Your Schedule
    8. Unit 1 Review
    9. Unit 1 Practice and Assessment
  12. Unit 2: Measuring the Body
    1. Jolene's Migraines
    2. The Scientific Process
    3. Scientific Models
    4. Measuring Heart Rate
    5. Heart Beats Per Lifetime
    6. Human Dimensions
    7. Body Surface Area
    8. Dosage Calculations
    9. Unit 2 Review
    10. Unit 2 Practice and Assessment
  13. Unit 3: Errors in Body Composition Measurement
    1. Body Mass Index
    2. The Skinfold Method
    3. Pupillary Distance Self-Measurement
    4. Working with Uncertainties
    5. Other Methods of Reporting Uncertainty*
    6. Unit 3 Review
    7. Unit 3 Practice and Assessment
  14. Unit 4: Better Body Composition Measurement
    1. Body Density
    2. Body Volume by Displacement
    3. Body Weight
    4. Measuring Body Weight
    5. Body Density from Displacement and Weight
    6. Under Water Weight
    7. Hydrostatic Weighing
    8. Unit 4 Review
    9. Unit 4 Practice and Assessment
  15. Unit 5: Maintaining Balance
    1. Balance
    2. Center of Gravity
    3. Supporting the Body
    4. Slipping
    5. Friction in Joints
    6. Tipping
    7. Human Stability
    8. Tripping
    9. Types of Stability
    10. The Anti-Gravity Lean
    11. Unit 5 Review
    12. Unit 5 Practice and Assessment
  16. Unit 6: Strength and Elasticity of the Body
    1. Body Levers
    2. Forces in the Elbow Joint
    3. Ultimate Strength of the Human Femur
    4. Elasticity of the Body
    5. Deformation of Tissues
    6. Brittle Bones
    7. Equilibrium Torque and Tension in the Bicep*
    8. Alternative Method for Calculating Torque and Tension*
    9. Unit 6 Review
    10. Unit 6 Practice and Assessment
  17. Unit 7: The Body in Motion
    1. Falling
    2. Drag Forces on the Body
    3. Physical Model for Terminal Velocity
    4. Analyzing Motion
    5. Accelerated Motion
    6. Accelerating the Body
    7. Graphing Motion
    8. Quantitative Motion Analysis
    9. Falling Injuries
    10. Numerical Simulation of Skydiving Motion*
    11. Unit 7 Review
    12. Unit 7 Practice and Assessment
  18. Unit 8: Locomotion
    1. Overcoming Inertia
    2. Locomotion
    3. Locomotion Injuries
    4. Collisions
    5. Explosions, Jets, and Rockets
    6. Safety Technology
    7. Crumple Zones
    8. Unit 8 Review
    9. Unit 8 Practice and Assessment
  19. Unit 9: Powering the Body
    1. Doing Work
    2. Jumping
    3. Surviving a Fall
    4. Powering the Body
    5. Efficiency of the Human Body
    6. Weightlessness*
    7. Comparing Work-Energy and Energy Conservation*
    8. Unit 9 Review
    9. Unit 9 Practice and Assessment
  20. Unit 10: Body Heat and The Fight for Life
    1. Homeostasis, Hypothermia, and Heatstroke
    2. Measuring Body Temperature
    3. Preventing Hypothermia
    4. Cotton Kills
    5. Wind-Chill Factor
    6. Space Blankets
    7. Thermal Radiation Spectra
    8. Cold Weather Survival Time
    9. Preventing Hyperthermia
    10. Heat Death
    11. Unit 10 Review
    12. Unit 10 Practice and Assessment Exercises
  21. Laboratory Activities
    1. Unit 2/3 Lab: Testing a Terminal Speed Hypothesis
    2. Unit 4 Lab: Hydrostatic Weighing
    3. Unit 5 Lab: Friction Forces and Equilibrium
    4. Unit 6 Lab: Elastic Modulus and Ultimate Strength
    5. Unit 7 Lab: Accelerated Motion
    6. Unit 8 Lab: Collisions
    7. Unit 9 Lab: Energy in Explosions
    8. Unit 10 Lab: Mechanisms of Heat Transfer
  22. Design-Build-Test Projects
    1. Scale Biophysical Dead-lift Model
    2. Biophysical Model of the Arm
    3. Mars Lander
  23. Glossary

28

Body Volume by Displacement

Volume by Displacement

The displacement method (submersion, or dunking method) can be used to accurately measure the volume of the human body and other oddly shaped objects by measuring the volume of fluid displaced when the object is submerged, as illustrated in the figure below.

A toy dinosaur is shown next to a cylinder of water with marking indicating volume. To the right, dinosaur is now submerged in the water and the water level is higher in up the cylinder.
When the dinosaur is submerged some of the water is displaced and the water level rises. The displaced volume is measured by reading the gradings, in this case 49 to 53, for a total of 4 volume units (which could be cm3 for a toy dinosaur or m3 for a real one). Image credit: Greg Golz, Exploring Science

[1]

Body Volume

Measuring body volume with the displacement method requires specialized equipment, such as a large tub of water with volume grading (markings) or a special scale that can measure the apparent weight of a submerged person. Recently technologies have been developed that allow for air rather than water to be used as the submersion fluid, opening up the method to a broader set of the population [2]

A baby can be seen through an observation window on a large machine in which the baby is enclosed. A healthcare professional operates the machine to measure the baby's body fat percentage.
“Infant body composition through air displacement plethysmography” by Cosmed via Wikimedia Commons

[3]

  1. "Density Using Displacement" by Greg Golz, https://sites.google.com/site/sciencegolz/ is licensed under CC BY 4.0 ↵
  2. "Bod Pod Services" by Oregon Clinical & Translational Research Institute, Oregon Health Sciences University. ↵
  3. By Cosmed [CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0)], from Wikimedia Commons↵

Annotate

Next Chapter
Body Weight
PreviousNext
TBH...just interesting health-y books
Copyright © 2020 by Lawrence Davis. Body Physics: Motion to Metabolism by Lawrence Davis is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, except where otherwise noted.
Powered by Manifold Scholarship. Learn more at
Opens in new tab or windowmanifoldapp.org