Viet Tran and Seth Robertson, two engineering students from George Mason University invented a device that puts out fire with nothing but sound waves. It is a speaker the size of a subwoofer a little bigger than a regular fire extinguisher, and plays a really loud bass for optimal sound waves. At first, they thought this would be a failing project. But it turns out that now they are trying to get their invention patented and turn it into something bigger.
Regular fire extinguishers are full of chemicals, leaves powder and foam everywhere; and when putting out a fire with water, it leaves behind a big mess too while probably destroying the things that the fire didn't get to anyway. This new way of putting out a fire can be greatly beneficial. It will certainly leave less of a mess. It leaves any harsh mad made chemicals out of the picture. This can be put over stove tops to put out kitchen and grease fires. They even think astronauts could deploy them, since the extinguisher contents would spread all over in space. Sound waves can still be directed without gravity, so there is a great possibility that it could work. All of this was a senior design project, and I think this is something that can actually be helpful to our society in the future, unlike many other things being invented today.
http://www.kulr8.com/story/28673486/new-fire-extinguisher-uses-sound-waves-to-put-out-flames
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