emulsion

Definitions

General English

General Science

  • noun a suspension of one liquid such as oil in another such as water
  • noun a type of water-based paint, usually giving a matt finish

Astronomy

  • The part of a photographic film which responds chemically to incident light to produce an image

Cars & Driving

  • noun a mixture of two liquids which do not fully mix, such as oil and water, or specifically of petrol and air in a carburettor

Construction

  • A mixture of two liquids that are insoluble in one another and in which globules of one are suspended in the other (such as oil globulesin water).
  • The mixture of solid particles and the liquid in which they are suspended but insoluble, as in a mixture of uniformly dispersed bitumen particles in water, in which the cementing action required in roofing and waterproofing would occur as the water evaporates.

Food

  • A mixture of two or more immiscible liquids or semi-solids in which one is divided into very small droplets (less than 0.01 mm diameter) dispersed in the other(s). Mayonnaise, hollandaise sauce and cake batters are typical examples.
  • butter whisked into salted boiling water, used for reheating vegetables just before service to give a pleasing sheen

Media Studies

  • noun the chemical coating on film that is light-sensitive and records the image, available in different speeds and altitudes

Publishing

  • noun a light-sensitive coating on photographic film or paper

Real Estate

  • noun a water-based paint used for interior decorating, usually with a matt or silk finish

Origin & History of “emulsion”

An emulsion is an undissolved suspension of tiny drops of one liquid dispersed throughout another. The classic example of this is milk – whence its name. It comes from modern Latin ēmulsiō, a derivative of ēmulgēre ‘drain out, milk out’. This was a compound verb formed from the prefix ex- ‘out’ and mulgēre ‘milk’, a distant relative of English milk. The word’s familiar modern application to paint dates from the 1930s.
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