Definition of "effervescence" [ef•fer•ves•cence]

• The escape of gas from solution in a liquid, especially the escape of carbon dioxide from a carbonated drink (noun)

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• "Wherever she appeared, the vivid personality of Mrs. Stewart made a kind of effervescence which that indescribable entity, a vivid personality, is sure to keep fizzing about it."
• "The "effervescence" he refers to was chlorine, which he proceeded to confine in a suitable vessel and examine more fully."
• "Except in years he was not young; he could not manage to be "clubable"; he was serious and awkward at a supper party; he was altogether without the effervescence which is necessary in order to avoid flatness."