PROBLEM TO BE SOLVED: To improve the cost of energy and the like. SOLUTION: An upward energy is generated in a tank by utilizing the difference in gravity between water (liquid or the like) and air (gas or the like). Connect a device with a splash that can open and close the upward energy generated in the tank, and a chain-shaped and crank-shaped bicycle to convert it into rotational energy. This rotational energy transfer device is installed in the center of the tank. Fill the tank with water (liquid, etc.) from a pipe, etc. Fill the tank with compressed air (gas, etc.). Pour water (liquid, etc.) downward from the top to the bottom. The energy is used as electricity by using a generator or used as another energy source. The lower water (liquid, etc.) is brought up and reused by the power that converts the gravity difference between liquid and gas into rotational energy. [Selection diagram] Fig. 1
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