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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.
Bubbles are pockets of soap and water that are filled with air. When soap and water are mixed together and air is blown into the mixture, the soap forms a thin skin or wall and traps the air, creating a bubble. Soap bubbles are not the only kind of bubbles. You can find bubbles in lots of liquids.