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Tag Archive: pressure


Deep Diving Maladies – High-Pressure Nervous Syndrome by Andy Davis HPNS or High-Pressure Nervous Syndrome (also called High-Pressure Neurological Syndrome)  can onset beyond a depth of 150m/500ft when using heliox or trimix breathing gasses. The severity of High-Pressure Nervous Syndrome is determined by the speed of descent (rate of compression), depth attained (absolute pressure) and […]

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The Physics of Diving – Scuba Gas Laws A concise explanation of the critical scuba gas laws for divers by Andy Davis Scuba diving is all about getting gas into your body while you are underwater. What complicates scuba diving is the way gasses behaves at depth, under pressure, in your body and in your […]

Scuba Cylinder Specifications for Buoyancy and Weighting Calculations When scuba divers calculate their buoyancy with an aluminum cylinder,  it is essential for them to know the relative buoyancy characteristics of their chosen cylinder – at full pressure capacity and also at their minimum reserve (500psi). The following tables provide buoyancy information on the common Luxfer […]

Technical versus Recreational Scuba Diving:  Why is there a need for Rules, Boundaries and Limitations? There is currently a strong debate about the need to differentiate between recreational and technical scuba diving. Some people believe that ‘diving is diving’ and question the need to draw a distinct boundary between recreational and technical diving pursuits. In […]