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Dive time Elapsed time between leaving the surface to descend, and

returning to the surface at the end of a dive.

EAD Abbreviation for equivalent air depth.

EAN Abbreviation for enriched air nitrox.

Enriched Air Nitrox Also called Nitrox or Enriched Air = EANx. Air that has

some oxygen added. Standard mixes are EAN32 (NOAA

Nitrox I = NN I) and EAN36 (NOAA Nitrox II = NN II).

Equivalent Air Depth Nitrogen partial pressure equivalent table.

Floor The deepest depth during a decompression stop dive at which

decompression takes place.

Freediver A breath-holding diver whose only source of oxygen are his

lungs filled with surface air.

Half-time After a change in ambient pressure, the amount of time

required for the partial pressure of nitrogen in a theoretical

compartment to go half-way from its previous value to

saturation at the new ambient pressure.

Hypercapnia

Increased amount of carbon dioxide in the blood. A diver

who does not rest adequately between breath-hold dives will

have elevated carbon dioxide levels. This can predispose hin

to carbon dioxide toxicity or blackout.