PROBLEM TO BE SOLVED: To provide a method that enables a bubble diameter of an ultrafine bubble to be simply and easily controlled by very little energy.;SOLUTION: In any kind of gas for being dissolved in water, speeds of calorie heat absorption and heat radiation are adjusted to enable control of a bubble diameter of an ultrafine bubble.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT
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