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fluid

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fluid

1. a substance, such as a liquid or gas, that can flow, has no fixed shape, and offers little resistance to an external stress
2. capable of flowing and easily changing shape
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

fluid

[′flü·əd]
(physics)
An aggregate of matter in which the molecules are able to flow past each other without limit and without fracture planes forming.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive
Fluidal colonies with reddish pink center and irregular margins are usually virulent while dark colored non-fluidal colonies with darker colors and smooth margins are normally avirulent.
12, medium-grained structure, and intergranular and rare fluidal texture, marked by the arrangement of platy minerals (plagioclases), were observed.
In that location the ignimbrite does not have a defined base, with a vitrophyre, but rather appears to continue downward into fluidal rhyolites, suggesting that the ignimbrite corresponds to an intracaldera facies rather than an outflow sheet.
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