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Mexican teenager wins gold with sound-wave fire extinguisher prototype
A post says the portable device uses low-frequency sound waves (~30 Hz) to disrupt airflow and extinguish small fires.
TLDR
One post says 16-year-old Ángela Karime Hernández Venegas of Altamira, Tamaulipas, built Vortex Tech and won gold. Another describes the portable prototype as using sound waves around 30 Hz to disrupt the air feeding small flames instead of using water or chemicals.
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