The surface tension between two liquids, between a gas and a liquid, or the interfacial tension between a liquid and a solid can all be reduced by chemical molecules called surfactants. Detergents, wetting agents, emulsifiers, foaming agents, and dispersants are all examples of surfactants in action. Surface-active agent is a combination of what is known as "surfactant." Although they are "surface active" in the strict sense, substances that raise surface tension are not commonly referred to as surfactants since they have the opposite impact. In an aqueous solution of a weakly polar compound, the substance will precipitate when an inorganic salt is added, which is a frequent example of surface tension rise. One of the reasons why many surfactants are ineffective in sea water is that the material may itself be a surfactant.
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