fluid

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fluid,

any substance that is able to flow. Of the four states of matterstates of matter,
forms of matter differing in several properties because of differences in the motions and forces of the molecules (or atoms, ions, or elementary particles) of which they are composed.
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, only a solidsolid,
one of the three commonly recognized states in which matter occurs, i.e., that state, as distinguished from liquid and gas, in which a substance has both a definite shape and a definite volume.
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 is not a fluid, since it has a definite shape that is not readily changed. Any liquidliquid,
one of the three commonly recognized states in which matter occurs, i.e., that state, as distinguished from solid and gas, in which a substance has a definite volume but no definite shape.
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, gasgas,
in physics, one of the three commonly recognized states of matter, the other two being solid and liquid. A substance in the gaseous state has neither definite shape nor definite volume. Like liquids, gases are fluids and assume the shape of their containers.
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, or plasmaplasma,
in physics, fully ionized gas of low density, containing approximately equal numbers of positive and negative ions (see electron and ion). It is electrically conductive and is affected by magnetic fields.
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 is classed as a fluid.

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.

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
References in periodicals archive ?
All other canine and equine viruses used in the hemagglutination inhibition (HI) assay were grown in 10-day old embryonated chicken eggs from which allantoic fluid was collected after 72 h and stored at -80[degrees]C.
Briefly, virus-infected allantoic fluid was diluted (1:1,000) into continuously stirred, chlorinated, chlorine demand-free phosphate buffer (0.
One group was inoculated with normal allantoic fluid as a negative control.
Infective allantoic fluid was diluted 1:10 in sterile phosphate-buffered saline (PBS), and 0.
RNA extraction and cDNA synthesis: Viral RNA was extracted from 250 [micro]L of all the clinical specimens and from 140 [micro]L of the virus-containing allantoic fluid (reference strains) using commercially available QIAamp Viral RNA Mini Kit (Qiagen GmbH, Hilden, Germany) as per manufacturer's instructions.
Allantoic fluid (AF) from two eggs selected randomly was harvested at an hourly interval and stored at -70[degrees]C.
Recent Highlights * Sales of Synagis(R) increased 12 percent to $472 million * FluMist supplements approved by FDA to reduce normal allantoic fluid (NAF) and eliminate FreezeBox storage requirements * Ex-U.
Allantoic fluid from the injected eggs agglutinated 0.
3 showed embryonic mortality before 36 h in all inoculated eggs (4/4) and HA activity was detected (2 (8) and 2 (11)) in the allantoic fluid.