Flash fires may occur in environments where fuel, typically flammable gas or dust, is mixed with air in concentrations suitable for combustion.

In flash fire explosions, the flame spreads at subsonic velocity, so the overpressure damage is usually negligible and the bulk of the damage comes from the thermal radiation and secondary fires. When inhaled, the heated air resulting from a flash fire can cause serious damage to the tissue of the lungs, possibly leading to death by asphyxiation. Flash fires can lead to smoke burns.

Clothing made of fire-retardant materials (eg. Nomex) limits the injury caused by flash fires to the protected body areas. Even normal clothing can provide partial protection.

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