asphyxiant

Asphyxiant gases in the breathing air are normally not hazardous.

Notable examples of asphyxiant gases are nitrogen, argon, and helium.

Many inhalants act primarily as asphyxiant gases, with their primary effect due to oxygen deprivation.

Only where elevated concentrations of asphyxiant gases displace the normal oxygen concentration a hazard exists.

However most asphyxiant gases are efficient at flushing away carbon dioxide and thus this breathless feeling does not occur.

The Earth's atmosphere is made of 79% asphyxiant gases (mainly nitrogen), and 21% oxygen.

On the other hand, hydrogen's considerable buoyancy and lack of toxicity other than as an asphyxiant work in its favor.

An asphyxiant gas is a nontoxic or minimally toxic gas which reduces or displaces the normal oxygen concentration in breathing air.

Early mining deaths due to mining fires and explosions were often a result of encroaching asphyxiant gases as the fires consumed available oxygen.

Because asphyxiant gases are relatively inert and odorless, their presence in high concentration may not be noticed, except in the case of carbon dioxide (hypercapnia).

The risk of breathing asphyxiant gases is frequently underestimated leading to fatalities, typically from breathing helium in domestic circumstances and nitrogen in industrial environments.

This division includes compressed gas, liquefied gas, pressurized cryogenic gas, compressed gas in solution, asphyxiant gas and oxidizing gas.

A gas chamber is an apparatus for killing humans or animals with gas, consisting of a sealed chamber into which a poisonous or asphyxiant gas is introduced.

The specific guidelines for prevention of asphyxiation due to displacement of oxygen by asphyxiant gases is covered under CGA's pamphlet SB-2, Oxygen-Deficient Atmospheres.

The handling of compressed asphyxiant gases and the determination of appropriate environment for their use is regulated in the United States by the Occupational Safety and Health Administration (OSHA).

While canaries were typically used to detect carbon monoxide, tools such as the Davy lamp and the Geordie lamp were useful for detecting methane and carbon dioxide, two asphyxiant gases.

Confined spaces that present special hazards to workers, including risks of toxic or asphyxiant gas accumulation, fires, falls, flooding, and entrapment may be classified as permit-required confined spaces depending on the nature and severity of the hazard.

Miners could place the safety lamp close to the ground to detect gases, such as carbon dioxide, that are denser than air and so could collect in depressions in the mine; if the mine air was oxygen-poor (asphyxiant gas), the lamp flame would be extinguished (black damp or chokedamp).