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 ?
Arginine esterase, also known as canine prostate specific protein (CPSE) is a protein with enzymatic activity that is found in high concentrations in the canine prostatic fluid and has been associated with fertility (MCENTEE et al.
Homologous prostatic fluid added to frozen-thawed dog spermatozoa prior to intravaginal insemination of bitches resulted in better fertility than albumin-free TALP.
Your examination is fairly normal," he continued as he placed one sample of the expressed prostatic fluid on a culture plate for bacterial culture and another sample on a slide to examine under the microscope.
The normal prostate gland is inherently resistant to bacterial infection, with natural host defense mechanisms including genital tract mucosal defense barriers, acidity of prostatic fluid (pH 6.
The prostatic fluid is then analyzed under a microscope for signs of inflammation and infection.
In the present study, we investigated the formation of PSA-ACT complex in serum and in prostatic fluid.
Prostatic fluid specimens were collected from men of ages [less than or equal to] 40 years who were seen as outpatients in the Urology Clinic at Northwestern Memorial Hospital (Chicago, IL).
Some specimens of seminal plasma and prostatic fluid were also subjected to affinity chromatography before electrophoresis for comparison.
5 mL of prostatic fluid or seminal plasma, the latter two having been diluted to 5.
Men with BPH often have low levels of zinc in their prostatic fluids.