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adj. floating above or on the surface

Wikipedia English The Free Encyclopedia

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Precipitation (chemistry)
Precipitation is the creation of a solid in a solution or inside another solid during a chemical reaction or by diffusion in a solid. When the reaction occurs in a liquid solution, the solid formed is called the 'precipitate'.The chemical that causes the solid to form is called the 'precipitant'. Without sufficient force of gravity (settling) to bring the solid particles together, the precipitate remains in suspension. After sedimentation, especially when using a centrifuge to press it into a compact mass, the precipitate may be referred to as a 'pellet'. The precipitate-free liquid remaining above the solid is called the 'supernate' or 'supernatant'. Powders derived from precipitation have also historically been known as 'flowers'. sometimes the formation of a precipitate indicates the occurrence of a chemical reaction. if silver nitrate solution is poured into a solution of sodium chloride, a chemical reaction occurs forming a white precipitate of silver chloride. when potassium iodide solution reacts with lead nitrate solution, a yellow precipitate of lead iodide is formed. Precipitation may occur if the concentration of a compound exceeds its solubility (such as when mixing solvents or changing their temperature). Precipitation may occur rapidly from a supersaturated solution.

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WordNet 2.0 Dictionary

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1. a liquid lying above a sediment (floating on the surface)
(hypernym) liquid

1. of a liquid; floating on the surface above a sediment or precipitate; "the supernatant fat was skimmed off"
(similar) supported
(classification) chemistry, chemical science

Webster's Revised Unabridged Dictionary (1913)

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The liquid remaining after solids suspended in the liquid have been sedimented by gravity or by centrifugation. Contrasted with the solid sediment, or (in centrifugation) the pellet.
Swimming above; floating on the surface; as, oil supernatant on water.

Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About

Free English-Vietnamese Dictionary

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supernatant /,sju:pə'neitənt/
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