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 ?
In hydrallantois, accumulation of allantoic fluid was rapid due to placental abnormalities and possible interference with sodium metabolism at cellular level (Jackson, 1980).
This observation is interesting, because some authors recommend testing the allantoic fluid for hemagglutination activity only from dead embryos.
Hemagglutination (HA) test is used to harvest allantoic fluid from embryonating chicken eggs for hemagglutinating agents, such as type A influenza (Killian, 2008).
All of these samples were inoculated into the allantoic cavity of 9 to 11 day old chicken embryos and the allantoic fluids were harvested after 48 hrs.
After 18 hrs of dilation therapy, cervix was properly dilated and allantoic cavity (water bag) ruptured and about 45-50 liters of allantoic fluid escaped out from birth canal.
The total RNA was extracted from the allantoic fluid using TRIzol reagent (Thermo Fisher Scientific) according to the manufacturer's protocol.
The allantoic fluid tested negative through hemagglutination test and PCR for common duck viruses, including avian influenza virus, Newcastle disease virus and duck herpesvirus 1.
The chicken embryo died within 2-5 days post inoculation and showing IBV specific lesions were harvested allantoic fluid and 50% chicken infectious dose (EID50) was calculated 103 EID50 by inoculation of serial 10 fold dilution of virus in 10-day-old SPF embryonated chicken eggs.
Rupture of fetal membranes resulted in 90-100 liters of amber colored allantoic fluid gushing from uterus which confirmed our diagnosis as hydroallantois.
The virus identification from the positive allantoic fluid was done through hemagglutination inhibition test and the confirmation was done through RT-PCR (Siddique et al., 2008).
Fresh infective allantoic fluid obtained after passaging the AIV H9N2 in embryonated eggs with a HA titer greater than 1/16 was diluted 1/10 in sterile isotonic saline.
Allantoic fluid of the 6 cultured specimens was then shipped to the University of Florida for confirmation testing and sequencing.