In order to fully appreciate the physiological problems that can be encountered while diving, one must thoroughly understand the concepts of pressure, the physical characteristics of gases and the basic laws that govern gases and their effects on the body. Terminology and Definitions Compression-That part of a dive that increases pressure upon a diver. The deeper a diver goes-the more the pressure. Decompression-That part of a dive when the diver ascends toward the surface, decreasing the pressure. In a chamber dive, that part of a dive when the pressure is being lowered. Recompression-a return to compression after ascent to the surface on a water dive; a return to surface pressure from altitude; a term used to describe medical treatment of decompression sickness
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