Dive computer
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A dive computer, personal decompression computer or decompression meter is a device used by an underwater diver to measure the elapsed time and depth during a dive and use this data to calculate and display an ascent profile which, according to the programmed decompression algorithm, will give a low risk of decompression sickness. A secondary function is to record the dive profile, warn the diver when certain events occur, and provide useful information about the environment.
Hydrospace Explorer Trimix and rebreather dive computer. Suunto Mosquito with aftermarket strap and iDive DAN recreational dive computers
iDive DAN personal dive computer display showing decompression requirement and other data during a dive The central band shows time to surface from current depth, stop depth and stop time.
The dive computer eliminated the previously mandatory interconnected use of three pieces of equipment: diving watch (top right), depth gauge (bottom right) and waterproof decompression table (left).
A dive computer incorporating Nitrox functions (Suunto Vyper Air)
Pressure
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Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure is the pressure relative to the ambient pressure.
The effects of an external pressure of 700 bar on an aluminum cylinder with 5 mm (0.197 in) wall thickness
Water escapes at high speed from a damaged hydrant that contains water at high pressure
Low-pressure chamber in Bundesleistungszentrum Kienbaum, Germany