| English | Hungarian |
| active participation The involvement, either by an individual or a group of individuals, in their own governance or other activities, with the purpose of exerting influence | aktív részvétel |
| active population The number of people available and eligible for employment within a given enterprise, region or nation | aktív népesség |
| surface-active agent A substance that, when used in small quantities, modifies the surface properties of liquids or solids. A surface-active agent reduces surface tension in a fluid or the interfacial tension between two immiscible fluids, such as oil and water. Surfactants are particularly useful in accomplishing the wetting or penetration of solids by aqueous liquids and serve in the manner of detergent, emulsifying, or dispersing agents. They are more effective than soap in certain situations and are used by conservators for such purposes as cleaning, wetting, and dispersing | felületaktív anyag |
| surface active compound Any soluble substance composed of two or more unlike atoms held together by chemical bonds that reduces interfacial tension between liquids or a liquid and a solid, often used as detergents, wetting agents and emulsifiers | felületaktív vegyület |
