Smoke ring guns are devices designed to create and project rings of smoke into the air. They typically consist of a chamber where smoke is generated, and a nozzle that shapes and releases the smoke in a circular form. When the gun is fired, a burst of air pushes the smoke out, forming a visible ring that can travel a short distance. These guns are often used for entertainment purposes, such as in parties or performances. They can also be found in scientific demonstrations to illustrate principles of fluid dynamics and air pressure. Smoke ring guns can be made from simple materials, making them accessible for DIY projects.