Accession Number : AD0779302

Title :   Breathing Mixtures.

Descriptive Note : Technical memo.,

Corporate Author : GEORGE WASHINGTON UNIV WASHINGTON D C DEPT OF SCIENCE COMMUNICATION

Personal Author(s) : Hamilton,R. W. , Jr

Report Date : 29 DEC 1973

Pagination or Media Count : 92

Abstract : The report is concerned with the elements involved in the choice of breathing mixtures for diving. Two aspects are obligatory from the beginning: a diver's breathing gas must be supplied under pressure approximately equal to that of the divers' lungs, and all mixtures must contain oxygen. Beyond this the tradeoffs begin, and the ideal choice of gas is a compromise of several factors. These factors -- oxygen toxicity, metabolism, inert gas narcosis, high pressure nervous syndrome, density, voice, thermal properties, decompression, fire safety, cost and ligistics -- are covered. Current diving modes require the selection of optimal breathing mixtures for each of several operational situations. These include scuba, closed and semi-closed breathing rigs, hose-supplied gas, and the atmosphere of both submerisible and deck chambers; in addition to the equipment used, the particular diving situation affects the choice of gas.

Descriptors :   *Gases, *Diving, Mixtures, Respiration, Hyperbaric conditions, Decompression sickness, Fire safety, Diver equipment

Subject Categories : Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE