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Hydrochloric acid (IUPAC name: chlorine [1]), also known as hydrochlororic acid, is an aqueous solution of hydrogen chloride (chemical formula: HCl). It is a strong inorganic acid with a wide range of industrial uses. Hydrochloric acid is a colorless and transparent liquid with a strong pungent odor and high corrosiveness. Concentrated hydrochloric acid (with a mass fraction of about 37%) has strong volatility, so when a container containing concentrated hydrochloric acid is opened, hydrogen chloride gas will evaporate and combine with water vapor in the air to produce small droplets of hydrochloric acid, causing acid mist to appear above the bottle mouth. Hydrochloric acid is the main component of stomach acid, which can promote food digestion and resist microbial infections.