Abstract: Provided are: [1] a foaming method including: a step (X) of mixing a foamable composition containing a foaming agent (A) having a time required for a reduction in dynamic surface tension thereof to start of 60,000 ms or less, which is measured by a maximum bubble pressure method, and an organic solvent (B), and a gas, and foaming the composition; and a step (Y) of reducing the size of foam with a porous body; and [2] an article including: a foam discharge container; and a foamable composition in the foam discharge container, wherein the foamable composition contains a foaming agent (A) having a time required for a reduction in dynamic surface tension thereof to start of 60,000 ms or less, which is measured by a maximum bubble pressure method, and an organic solvent (B), and wherein the foam discharge mechanism of the foam discharge container includes a porous body.