Nitrogen safety: invisible does not mean harmless
Nitrogen is a normal part of air and is not toxic in the usual sense, but concentrated gas can displace oxygen. Liquid nitrogen adds extreme cold and pressure hazards.
Oxygen displacement
Nitrogen is colorless and odorless. A release can reduce oxygen without a reliable smell or visual warning. Oxygen-deficient atmospheres can rapidly impair judgment and cause unconsciousness or death.
Cryogenic and pressure risks
Liquid nitrogen can cause severe cold injuries and expands greatly into gas as it warms. Use compatible vented vessels, ventilation, monitoring, training, and workplace controls. Never enter a suspected oxygen-deficient area to attempt an untrained rescue.
Sources and further reading
These references are starting points. Check the source directly for definitions, dates, units, and context. This is an educational overview, not an operating manual or professional advice.
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