Hot Air Stirling Engine Motor Model Electricity Generator Metal Base Science Educational Toy With this Stirling engine, you can give an intuitive explanation and also inspires students' curiosity. Besides, with fancy appearance, it can also be a decoration at your home or office. Features: How it Works A Stirling engine is a heat engine that operates by cyclic compression and expansion of air or other gas (the working fluid) at different temperatures, such that there is a net conversion of heat energy to mechanical work. Operating Requirement The electric engine generates enough power and light up the mini lamp after it reach a certain speed. Intuitive Explanation Inspires students' curiosity, make teaching more intuitive and interesting. High-profile Decoration With fancy appearance and compact body, is undoubtedly the best decor for your home or office. Hot Air Stirling Engine Size: 145 * 90 * 84mm. Specifications: Color: Silver & Gold Material: Metal Item Size: 14.5 * 7.5 * 8cm/ 5.7 * 2.9 * 3.1in Item Weight: 467g/ 16.5oz Package Size: 17.5 * 11.5 * 9.5/ 6.9 * 4.5 * 3.7in Package Weight: 576g/ 1.3lb. Package List: 1 * Stirling Engine 1 * Alcohol Lamp (without liquid)