Accessories and Parts -Stirling Engine Model Educational Toy Highlights Generic Brand Stirling Engine Educational Model Toy Description: Physical Science DIY Kits - Stirling Engine Model, Heat Generator External Combustion Engine Model Kits, Physical Power Theory - Similar to the internal combustion engine: the burning alcohol lamp provides heat to expand the gas inside, then the internal molecular power of the gas increases and works strongly at the flywheel. With the help of flywheels, heat energy turns into mechanical work Great educational toy - Experimental teaching aids in the classroom or laboratory, cultivate children's interest in physics, more intuitive and easy to understand Great gift for your friends or your family. A Stirling engine is a heat engine that operates by cyclically compressing and expanding air or another gas (the working fluid) at different temperatures, so that there will be a net conversion of thermal energy into mechanical work . Specification: Material: Metal, Plastic and Glass Assembled Size (LxWxH): Approx. 16 x 8 x 9 cm / 6.3 x 3.15 x 3.54 inch Lamp color will be random Package includes: 1 Stirling engine model (lamp color will be random)