A group of hikers look at one of the smoke rings Europe's most active volcano, Mount Etna, is blowing scores of ethereal "vortex rings" every day from a single vent located in one of its most active ...

Smoke rings are being seen in a new light. Doughnut-shaped structures called vortex rings are sometimes seen swirling through fluids. Smokers can form them with their mouths, volcanoes can spit them ...

Mount Etna in Sicily has been blowing spectacular ‘smoke rings’ into the sky since Wednesday. The volcano, which towers over the historic port city of Catania, is the largest in Europe and one of the ...

Tourists in Italy have been treated to quite the show as Mount Etna, the largest active volcano in Europe, has been blowing spectacular "smoke rings" into the sky since last week. The rare phenomenon, ...

To see the gun in action, go to http://tinyurl.com/8xu2npq Engineers at the Battelle Memorial Institute are patenting a special vortex gun they developed. It might ...

ONE of the commonest examples of a vortex phenomenon may be observed in the formation of smoke rings. Detailed studies of the structure of smoke rings were made many years ago by R. W. Wood 1. Smoke ...

Smoke rings are being seen in a new light. Doughnut-shaped structures called vortex rings are sometimes seen swirling through fluids. Smokers can form them with their mouths, volcanoes can spit them ...

THROUGH the laws of vortex motion have been extensively examined by the ablest mathematicians, comparatively few experiments appear to have been made to study the nature of these motions in air and ...