Archive for the ‘Terminology’ Category
Electronis device that sends signals to the heart causing a rhythm change.
Professional Association of Diving Instructors.
Pressure exerted by a single component of a gas within a gas mixture or dissolved in a liquid.
Partial Pressure, Carbon Dioxide (PCO2)
Pressure exerted by carbon dioxide in any mixture of gases or dissolved in a liquid.
Partial Pressure, Nitrogen (PN2)
Pressure exerted by nitrogen component in any Read the rest of this entry »
Depressed mental state, anywhere from confusion or drowsiness to coma.
Swollen, blood-filled linings of the nose and sinuses, often due to Read the rest of this entry »
This is a method of getting close-up pictures of a subject by using special close-up accessories attached to the camera’s lens.
Mal de mer
Motion sickness or sea sickness.
Familial condition produced by an Read the rest of this entry »
Lowering of body temperature by full body immersion in cold water. See hypothermia.
Infection with the Human Immune Virus. Not necessarily a contra-indication of diving.
Infection, Marine Wound
Infection with marine organisms that are Read the rest of this entry »
The “H” Factors in Diving
Half the time it takes for a dissoved gas in a tissue (such as nitrogen) to equilibrate to a new pressure, or to reach full saturation at a new pressure. Theoretical tissue half times are used in designing dive tables and algorithms for dive computers.
Related to Haldane’s theory that nitrogen is taken up and given off in exponential fashion during a dive, and that there is Read the rest of this entry »
Gas Absorption and Elimination
Dissolved gases such as nitrogen are absorbed into the blood and tissues during the course of a dive. The level of saturation depends on the depth of the dive. The elimination of Read the rest of this entry »
The “F” Factors in Diving
The part of the regulator which attaches to the scuba tank valve that lowers the tank pressure to ambient pressure + a pre-determined pressure (e.g., ambient + 140 psi). The term can also refer to the Read the rest of this entry »