effervescent

Effervescent is an adjective used to describe a liquid that releases bubbles of gas, typically carbon dioxide, as a result of a chemical reaction or the escape of a dissolved gas. The term is also used figuratively to describe a lively, enthusiastic, or bubbly personality or atmosphere.

Etymology: The word derives from the French effervescent and from Latin effervescere, meaning "to boil up." It is composed of ex- "out" and fervere "to boil," reflecting the bubbling appearance of gas escaping from a liquid.

In chemistry and beverages: Effervescence occurs when a gas is generated within a liquid or when dissolved gas comes out of solution. In carbonated beverages, carbon dioxide is dissolved under pressure and released when the container is opened. In chemical reactions such as acid with carbonate, carbon dioxide bubbles form rapidly.

In medicine and practical use: Effervescent tablets are dry preparations that contain an acid and a carbonate or bicarbonate salt. When placed in water they dissolve and release carbon dioxide, creating effervescence and forming a ready-to-drink solution. Common examples include effervescent analgesics and antacids, often using citric acid and sodium bicarbonate.

In everyday language: Effervescent can describe a person who is lively and engaging.