OBJECT Provide a functional gel which held micro-bubble inside. SOLVING MEANS At first fill the airtight container 2 with water (solution) and supply a gas such as hydrogen from the gas supply pipe 5 drive the supersonic wave vibratory plate 4 then the micro-bubbles 1b of the gas are generated. The diameter of the micro-bubbles 1b is for example nanosize then the speed of rise in the water is slow so it remains underwater for about 10 minutes even if the supersonic wave vibratory plate 6 is stopped.
