A vortex gun which can fire
doughnut-shaped rings of electrically charged gas could be by
firefighters to clear hallways clogged with smoke.The gun fires rings which revolve as they travel but, like the eye of a hurricane, remain calm within the interior, allowing them to carry a payload of electrically charged air.
The charge makes particles of smoke clump up and fall from the air like rain droplets, says a spokesman for Battelle, the Ohio-based company which has developed the technology. More Read
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