EntityQ1030571· pop 9· linked from 39 articlesvortex ringSign in to savetorus-shaped vortex in a fluid or gasConnectionsHermann von HelmholtzEntitymitral valveEntityelliptic integralEntitysmoke ringEntityair vortex cannonEntityIndonesiaCountryIcelandCountryEcuadorCountryGuatemalaCountryNicaraguaCountryAlaskaEntityheartEntitybloodEntitySicilyEntityInternational Standard Book NumberEntityvelocityEntityhelicopterEntityKyushuEntitydolphinEntityMount EtnaEntityCategoriesAerodynamicsAviation risksHelicopter aerodynamicsIncomplete lists from May 2012Vortices