7th International Physicists’ Tournament final fight, round one

Round one of IPT 7 final at the Faculty of Physics, University of Warsaw. The team of France reports on problem no. 2, Vortex cannon. The problem states “Vortex cannons can be easily constructed to create smoke/air rings. What factors influence the range of the rings? How can this range be maximized?“. For the final results and more information, please visit us at and