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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.
Unlike chewing gum, bubble gum is highly viscous so that it can easily be blown into a bubble shape. It has also been treated so that it is not sticky, so that if a bubble bursts, it will not coat the face and hair of the chewer.