Scuba diving

Scuba diving

Underwater diving in which the diver uses scuba gears to breathe underwater.

Industry: Sports

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Scuba diving

Purge valve

Sports; Scuba diving

Allow masks to be cleared without removal. Allows snorkels to be cleared easily.

Course director (CD)

Sports; Scuba diving

Level of instructor certification authorised to conduct instructor training.

Air compressor

Sports; Scuba diving

A machine that compresses or pressurises air; for scuba purposes, air is compressed from the atmospheric level (14. 7 psi at sea level) to the capacity of the tank, usually between 2500-3000 psi.

Air containing space of the ear bordered on one side by the tympanic membrane, which is exposed to any change in ambient pressure. Air pressure in the middle ear space can only be equalised through ...

The Valsalva Maneuver

Sports; Scuba diving

Method of manual equalizing of the inner ear. The pressure on the inside of the eardrum increases by closing the nasal passage (pinching your nose shut) and blowing gently forcing air into the inner ...