A smoke ring generator is a device designed to create visible rings of smoke that can travel through the air. These generators typically use a combination of air pressure and smoke to produce the rings, which are often seen in demonstrations or entertainment settings. The smoke is usually produced by burning a material, such as wood chips or oil, that creates a thick, visible smoke. The science behind smoke rings involves the principles of fluid dynamics. When the smoke is expelled in a circular motion, it forms a toroidal shape, allowing the ring to maintain its structure as it moves. Smoke ring generators can be found in various forms, including smoke ring guns and larger installations used in science demonstrations.