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Archimede’s Principal. Achimede’s Principal. 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
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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.