▎ 摘　　要

NOVELTY - The method involves a liquid containing one substance selected from the following group to a liquid supply region in which an ejection port forming element having an ejection port with a small diameter is placed in supply step. The liquid supplied to the liquid supply region is pressurized by a pressurizing unit in contact with the liquid and the liquid is ejected from the ejection port as droplets in ejection step. The group is comprised of thermally denatured materials, inorganic salts, amino acids and their salts, sugars/sugars and their salts, organic polymers and their salts, inorganic polymers and their salts, dispersions, and organic liquids. The thermally denatured material is selected from physiologically active substances, nucleic acid polymers, biopolymers and polymerizable monomers. The physiologically active substance is selected from an inhibitor, lipid, fatty acid, antibiotic or peptide. USE - Method for producing liquid containing ultra-fine bubbles. ADVANTAGE - The process stably produces ultra-fine bubble-containing liquid that is stored for a long time at a high concentration over a long period of time. DETAILED DESCRIPTION - The biopolymer is selected from a cytokine, hormone, growth factor, enzyme or protein, and where nucleic acid polymer is DNA or RNA. The dispersion is made of inorganic fine particles and organic fine particles. The inorganic fine particles are selected from fine particles made of carbon black, fullerene, graphene, carbon nanotubes, titanium oxide, magnetic particles, or apatite, and the organic fine particles are selected from pigment pigments, latex, liposomes, polylactic acid, polyglycolic acid, and polylactic acid. The microparticles are selected from a copolymer with polyglycolic acid, polyethylene glycol, polypropylene glycol, a copolymer of polyethylene glycol and polypropylene glycol, or cellulose nanofibers. The organic liquid is included of a flammable liquid and a non-flammable liquid. The flammable liquid is included of alcohols selected from methyl alcohol, ethyl alcohol, and isopropyl alcohol, polymerizable monomers, oils composed of one of hydrocarbons and siloxanes, gasoline, kerosene, light oil, naphtha, or jet fuel oil. A predetermined gas is dissolved in liquid. The liquid is ejected as droplets from multiple ejection ports formed in ejection port forming element. The liquid ejected from the ejection port is recovered. An INDEPENDENT CLAIM is included for an apparatus for producing an ultra-fine bubble-containing liquid, which is arranged in a liquid supply region to which a liquid containing one substance selected from the following group is supplied, and a discharge port forming element formed with a minute diameter discharge port. A pressurizing unit ejects the liquid as droplets from the ejection port by contacting and pressurizing the liquid supplied to the liquid supply region. A gas dissolving unit dissolves a predetermined gas in liquid. Multiple ejection openings are formed in ejection opening forming element, and liquid is ejected as droplets from each of multiple ejection openings by pressurizing liquid by pressurizing unit. The pressurizing units are provided facing each of multiple ejection ports, and each of multiple pressurizing devices pressurizes the liquid, thus ejecting the liquid as droplets from multiple ejection ports. The ejection port has a diameter of 100 μ m or less. The pressurizing unit is composed of a piezoelectric element that is displaced by applying a voltage, and pressurizes the liquid in the liquid supply region by displacement of the piezoelectric element, thus ejecting the liquid as droplets from the ejection port. A recovery unit (30) recovers the liquid ejected from the ejection port. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the device for producing liquid containing ultra-fine bubbles. 10Supply portion 11Gas dissolving tank 12Supply flow passage 13Recovery flow passage 30Recovery unit