Provided is a technique for adjusting the amount of change over time in ultra fine bubbles. A method for producing an ultra fine bubble, comprising: Irradiating a liquid containing ultra fine bubbles with an electromagnetic wave including at least one ultraviolet wavelength region of a UV-a wave, a UV-B wave, and a UV-C wave so that an integrated amount of ultraviolet light is 6 MJ/cm 2 or more, A method for adjusting the amount of change over time in ultra fine bubbles. Fig. 7

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