PROBLEM TO BE SOLVED: To provide a balloon-shaped weight reducing device capable of being easily handled and operated, and contributing to save energy.;SOLUTION: Gas 1 lighter than air such as hydrogen, helium, gas for lighting, and hot air is filled into an airtight bag 2. The bag 2 is attached to a moving article such as a bicycle, an automobile, a vessel, and an airplane by using a difference of specific gravity as buoyancy.;COPYRIGHT: (C)2008,JPO&INPIT
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