METHOD FOR METERING AIR BUBBLE-CONTAINING SURFACTANT SOLUTION AND METHOD FOR MANUFACTURING SURFACTANT- CONTAINING COMPOSITION

PROBLEM TO BE SOLVED: To provide a method for metering an air bubble-containing surfactant solution, capable of metering even an air bubble-containing surfactant solution by a general flowmeter, capable of reducing even equipment investment and capable of rapidly and efficiently measuring the flow rate of the air bubble- containing surfactant solution by a flowmeter, which is inexpensive and simple and not accompanied by large equipment such as load cell type equipment of a weight system or the like, without generating a flow rate error, and a method for manufacturing a surfactant-containing composition used in this metering method. SOLUTION: In the method for metering the air bubble-containing surfactant solution containing 5-50 volume % of air bubbles, the flow rate of the surfactant solution is measured under a pressure of 0.3-0.8 MPa. The surfactant-containing composition is manufactured by mixing the air bubble-containing surfactant solution, which is metered by the metering method, with other component.