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Kotie's Scuba Science FAQ - Answers to scuba diving and scuba gear questions

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Scuba Science Questions

What causes decompression sickness?

Decompression sickness, also known as "the bends", is caused by improper decompression during a dive. When diving the body will absorb excess nitrogen due to the increased surrounding pressure. If the diver ascends faster than the nitrogen can safely out-gas, bubbles will form in the blood and tissues. The bubbles can cause damage and develop symptoms in several parts of the body including: limbs, central nervous system, cerebral, pulmonary, inner ear and skin.

What does dema do?

DEMA is an acronym for Diving Equipment and Marketing Association. This is a trade association for businesses who are involved in the sport of scuba diving. DEMA exists to serve its members by identifying key issues that affect the growth and success of the scuba and snorkeling industry. It is the united voice that speaks on behalf of the sport and its operational function is to create focused programs that positively affect the industry.

What is a pressure group?

The Pressure Group is a rough estimation of your nitrogen-absorption state at the end of the dive.

What is absolute pressure?

Absolute pressure is the total pressure, including atmospheric and hydrostatic pressure.

What is charles law?

The pressure that a gas exerts on the walls of its container is determined by the momentum of the atoms and molecules of the gas, which in turn is determined by the temperature. As the temperature increases the atoms and molecules move faster, and so exert a greater pressure on the walls. If the walls are rigid, such that the volume of the container is held constant, then the relationship between pressure P and temperature T is given by Charles' Law: P = constant x T

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