Understanding Archimedes' Principle: Buoyancy, Density, and Pressure Relationships
This guide explores Archimedes' Principle, focusing on buoyancy and relevant factors such as object density, fluid density, volume, and weight. It discusses how objects behave in different fluids, with specific examples for saltwater (64 lbs/cu.ft), freshwater (62.4 lbs/cu.ft), and air (0.088 lbs/cu.ft). The states of buoyancy are examined, defining positive, neutral, and negative buoyancy according to the object's density in relation to the fluid. Additionally, it covers Boyle’s Law and pressure-volume relationships crucial for divers.
Understanding Archimedes' Principle: Buoyancy, Density, and Pressure Relationships
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Presentation Transcript
Buoyancy Factors • Density of the object • Size (volume) • Weight • Density of fluid • Salt water 64 lbs/Cu. Ft. • Fresh Water 62.4 lbs/ cu. Ft. • Air .088 lbs/cu. Ft.
States of Buoyancy • Object density < fluid density Object floats positive • Object density = fluid density Object hovers neutral • Object density > fluid density Object sinks negative
Buoyancy 32 lbs 1 cu ft Positive _______________________________________________ ____________________________________________________ 64 lbs 1 cu ft Neutral 64 lbs 1 cu ft Neutral 96 lbs 1 cu ft negative
Buoyancy ___________________________________ ________________________________________ 64 lbs 2 cu ft positive 64 lbs 1 cu ft positive 64 lbs 1/2 cu ft negative
Pressure Volume Relationship Boyle’s Law
Depth Pressure Vol Density fsw atm 0 1 1 1 33 2 ½ 2 66 3 1/3 3
Air Consumption Depth Press Vol PSI/min Dive Time 0 1 1 30 100 min. 33 2 ½ 60 50 min. 66 3 1/3 90 33 min. 99 4 ¼ 120 25 min.
