Description: Hot air stirling engine motor model kit physics teaching aids educational toys Burnning the alcohol lamp for a while, the expansion of air in the tube will work as a medium to run the pistons and flywheel, then the expanding air will be cooled in cold chamber. As this process will be repeatedly circulating, the flywheel will continuously work. The Hotter the tube gets, the faster the flywheel goes. Vary interesting! Great for cultivating students' interest in physics, more intuitive and easy to understand how heat engergy is converted into mechanical work. What is Stirling Engine? A stirling engine is a heat engine that operated by cyclic compression and expansion of air or other gas at different temperatures, such that there will be a net conversion of heat energy to mechanical work. Specification: Item Name: Stirling engine model Materials: Stainless steel+glass Package Includes: 1 Piece Stirling Engine Model Note: Some engines do not generate electricity Do not touch the baked test tube and the metal connected to it, so as not to burn. Long time light alcohol lamp, alcohol lamp can not easily touch, so as not to burn. Suitable for more than 8 years of age, 8 years of age need to operate under the guardianship of parents. When heating, do not touch the tube of alcohol lamp, combustion will produce moisture, if touched, may to tube cracking.