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An air vortex cannon is a toy that releases doughnut-shaped air vortices — similar to smoke rings but larger, stronger and invisible. The vortices can ruffle hair, disturb papers or blow out candles after travelling several metres.
An air vortex cannon can be made easily at home,<ref name="InstructableV">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name="Lunn">Template:Cite book</ref> from just a cardboard box.<ref name="StuSci">The Vortex Cannon - Student Science at YouTube. Accessed February 2013.</ref>
Air cannons are used in some amusement parks such as Universal Studios to spook or surprise visitors.Template:Citation needed
The Wham-O Air Blaster toy introduced in 1965 could blow out a candle at Template:Convert.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The commercial Airzooka was developed by Brian S. Jordan who claims to have conceived it when still a boy. A feature of the Airzooka is a loose non-elastic polythene membrane, tensioned by a bungee cord, rather than elastic membranes. This allows a much greater volume of air to be displaced.Template:Citation needed
A large air vortex cannon, with a Template:Convert wide barrel and a displacement volume of Template:Convert was built in March 2008 at the University of Minnesota, and could blow out candles at Template:Convert.<ref>Erbert and Gerberts Candle Cannon at Youtube. Accessed 9 Jan 2011</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
In 2012, a large air vortex cannon was built for Czech Television program Zázraky přírody (Template:Lit). It was capable of bringing down a wall of cardboard boxes from Template:Convert in what was claimed to be a world record.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
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- Home made vortex cannon using a cardboard box and a smoke machine from The URN Science Show.