Description: It is a fantastic item for the price and it will be a great toy for you or your families or your friends. It can also be used for teaching purpose; many of our customers are from educational positions. You put it on a cup of hot water then it will run like Forrest Gump. Please note that this item can NOT run on hand or router if you want that please buy our other items which are more expensive and better. A stirling engine is a heat engine that operates by cyclic compression and expansion of air or other gas the working fluid at different temperature levels such that there is a net conversion of heat energy to mechanical work.The engine is like a steam engine in that all of the engine's heat flows in and out through the engine wall. This is traditionally known as an external combustion engine in contrast to an internal combustion engine where the heat input is by combustion of a fuel within the body of the working fluid. Unlike the steam engine's use of water in both its liquid and gaseous phases as the working fluid the stirling engine encloses a fixed quantity of permanently gaseous fluid such as air or helium. As in all heat engines the general cycle consists of compressing cool gas heating the gas expanding the hot gas and finally cooling the gas before repeating the cycle.