A caustic substance, in chemistry, is one that causes corrosion, the deterioration of a material. A caustic substance can be acidic or basic, and concentrated solutions of acids and bases are common corrosive substances. Some sodium hydroxide, also called caustic soda, is one example. Caustic substances are harmful to living tissue and structures, but they have beneficial uses. For example, drain cleaners often use caustic substances to clear clogged drains. Look up Substance on Wiktionary, the free dictionary * in philosophy, Substance is that element of an object without which it would not exist. ... Chemistry (derived from the Arabic word kimia, alchemy, where al is Arabic for the) is the science that deals with the properties of organic and inorganic substances and their interactions with other organic and inorganic substances. ... Corrosion, atmospheric and biologic (Barnacles) Corrosion is deterioration of intrinsic properties in a material due to reactions with its environment. ... For alternative meanings see acid (disambiguation). ... The common (Arrhenius) definition of a base is a chemical compound that absorbs hydronium ions when dissolved in water (a proton acceptor). ... Flash point non flammable Supplementary data page Structure and properties n, εr, etc. ... Biological tissue is a substance made up of cells that perform a similar function. ... Drain cleaner is generally a corrosive chemical such as a strong acid or base, used to dissolve clogs in plumbing. ...