抄録
A soap bubble can be used as a capsule, which keeps concentration of the filling gas constant. When nitrogen gas fills in a soap bubble, it is useful for fire fighting like the fire-extinguishing ball. In the present study, the gas motions generated by the collapsed soap bubble have been visualized by using laser tomography method. From the observation, generation of two different kinds of flow from the soap bubble bursting is verified. One is the flow induced by pressure difference of a soap bubble, and the other is the flow induced by dynamics of the converging soap-liquid film. These flows affect significantly characteristics of the soap bubble extinguishment.
