A17-year-old student is making waves with her fire safety innovation. Ángela Karime Hernández Venegas, from Tamaulipas, Mexico, created a fire extinguisher that doesn’t require water or chemicals. Instead, it uses low-frequency sound waves, saving resources while remaining as portable and easy to carry as a regular extinguisher.
Named Vortex Tech, Hernández’s device includes a custom bucket that is also a barrel, a 12-volt battery, a frequency generator, an amplifier, and a speaker. The gadget generates a low frequency of 30 hertz, or 30 sound pulses per second.
The speaker then turns the frequency into sound waves, which are thrust toward a small circular opening at the end of the barrel. This generates a phenomenon known as vortex rings, in which a donut-shaped flow causes a slight turbulence in the surrounding air, striking and dissipating the oxygen fueling the flames.
Hernández felt inspired to build Vortex Tech after watching a video from the United States’s Defense Advanced Research Projects Agency (DARPA), which used a 13-foot-long sonic cannon to extinguish a flame using only sound waves.
“The main goal was to demonstrate that the physical principle [of vortex rings] could blow out a candle,” she told Spanish newspaper El País. “DARPA’s sonic cannon indicated that the method was feasible.”
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