Chapter 60 - Going With the Flow Chapter 6 Click to edit...

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Click to edit Master subtitle style 9/23/11 Going With the Flow Chapter 6
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9/23/11 What is a Fluid? Both liquids and gases are fluids Air and water are fluids that commonly exert forces on the human body
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9/23/11 Fluid Properties Density - mass/volume Viscosity – how thick the fluid; how much it clings
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9/23/11 Hydrostatic Pressure Force exerted by a fluid (air or water) Blanket example Greatest atmospheric pressure exerted at sea level Air = 21% oxygen; 78% nitrogen
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9/23/11 SCUBA Diving Every 33 ft (10m) = 14.7 psi Compressed air (and regulators) in tank keeps air cavities open Lower depth = increased pressure 1 hour of air on surface
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9/23/11 Buoyancy Tendency for something to float Direction always vertically upward, against gravity: Buoyant force Hot air balloon or blimp – hot air weighs less than surrounding cooler air; use helium which is a less dense gas Center of buoyancy = body’s center of volume Torso easier to float than legs
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9/23/11 Buoyancy Archimedes’ Principle Buoyant force acting on a body is equal to the weight of the fluid displaced by the body If buoyant force > gravity’s force object will float
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9/23/11 Buoyancy Muscle and bone very dense likely weighs more than the water it displaces sinks Salt water vs. fresh water Thicker wet suit Underwater weighing
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Chapter 60 - Going With the Flow Chapter 6 Click to edit...

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