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 ?
This proof-of-principle study aimed to clarify whether it is possible to define a high-risk group of ovarian cancer patients solely by looking at methylation changes in peritoneal fluids collected at the time of primary surgery.
Peritoneal fluid TNF-[alpha] levels of 15 pg/mL or higher diagnosed endometriosis with 100% sensitivity and 89% specificity.
The source of immunoglobulins and complements in normal peritoneal fluid and in cirrhotic or noncirrhotic ascites is not clear.
Only serum IL-6 and peritoneal fluid TNF-[alpha] showed a high sensitivity and specificity in differentiating the 56 women given a postsurgical diagnosis of endometriosis from the 8 women diagnosed with unexplained infertility and from the control group of 27 women who underwent tubal ligation or reanastomosis, Dr.
Mitogen(s) for endometrial-like cells can be detected in human peritoneal fluid.
To study the culture and sensitivity of peritoneal fluid in surgical peritonitis.
A gush of fluid can be a bad sign but is usually peritoneal fluid, not urine.
Isolates came from urine (35%), peritoneal fluid (22%), surgical wound (17%), intra-abdominal abscess (13%), pleural fluid (9%), and bile (4%).
Cultures of peritoneal fluid eventually grew M tuberculosis, but the positive results with PCR analysis allowed appropriate therapy to be instituted earlier.
continued to be symptomatic with fever, abdominal pain, and elevated serum and peritoneal fluid WBCs.
In our study, 15% of pleural and 17% of peritoneal fluid specimens were positive for malignant cells.
SAN DIEGO -- A study of six cytokines in blood and peritoneal fluid identified two that could compose the first nonsurgical tool for diagnosing endometriosis.