foam

Foam is a substance made up of many small bubbles of gas, such as air or other gases, trapped within a liquid or solid material. These bubbles create a lightweight, airy structure that can be soft and compressible. Foam forms naturally in processes like soap lather or artificially in products like cushions, insulation, or firefighting foam. Its properties depend on the size and stability of the bubbles, which influence things like shock absorption, insulation, or the ability to spread or hold a shape. Essentially, foam is a network of interconnected bubbles that provides volume and cushioning.