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bubble. 1  a nearly spherical body of gas contained in a liquid. 2  a small globule of gas in a thin liquid envelope. 3  a globule of air or gas, or a globular vacuum, contained in a solid. 4  anything that lacks firmness, substance, or permanence; an illusion or delusion.
Several bubbles make a foam. A soap bubble is an extremely thin film of soapy water enclosing air that forms a hollow sphere with an iridescent surface. Soap bubbles usually last for only a few seconds before bursting, either on their own or on contact with another object. They are often used for children's enjoyment, but they are also used in artistic performances. Assembling several bubbles results in a foam. When light shines onto a bubble it appears to change colour. Unlike those seen in a rainbow, which arise from diff