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. A Great Explanation: Teacher can make the explaining process much straightforward and students can better understand its principle. Safe Opeartion: Run freely on the top of a cup of hot water, no need to fire a alcohol lamp, for children. Operating Requirement: Start temperature difference between the product bottom contact and circumstance should be 25. Easy to Use: Gently flip the wheel, then it can run itself. Considerate Design: Exquisite frosted plunger can avoid leakage and the reduce abrasion. Note:If the friction between flywheel and support is big, please use a little graphite dry lube quiet it down nicely. "t use oil, because it will lead to oil-dirt. Low Temperature Stirling Engine Model DIY Kit Principle of Operation: Heating Expansion / Cold Compression Speed: 180rpm (max.) Note: Children under 12-year-old should be accompanied by adult when playing this product. color:Silver+gold Material:Metal Package Contents: 1 x Low Temperature Stirling Engine Model DIY Kit 1 x Chinese and English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don't hesitate to contact us. We are here to help and will do our best to assist you. Thank you for choosing our product. We hope you enjoy it!