critical density


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critical density

See mean density of matter.

critical density

[′krid·ə·kəl ′den·səd·ē]
(astronomy)
The mass density above which, it is believed, the expansion of the universe will slow down and reverse.
(chemistry)
The density of a substance exhibited at its critical temperature and critical pressure.
(civil engineering)
For a highway, the density of traffic when the volume equals the capacity.
(geology)
That degree of density of a saturated, granular material below which, as it is rapidly deformed, it will decrease in strength and above which it will increase in strength.
(thermodynamics)
The density of a substance at the liquid-vapor critical point.

critical density

That unit weight of a saturated granular material above which it will gain strength and below which it will lose strength when subjected to rapid deformation.
References in periodicals archive ?
However, once the colony reached an even higher, critical density, enough AHL accumulated outside the cells forming a pool from which all the bacteria took their cue.
One natural question that arises in the context of Theorem 1 is the following: is there a nice graph class such that there a exists a critical density [c.
c] represents the critical density of evenly spaced points of viscosity data covering a very wide range, and [W.
This tested an idea, favored for the last 15 years, that not only is the universe made of a substantial amount of invisible and presumably exotic dark matter, but that there is enough of it to give the universe a critical density - just the right amount of mass to keep the universe from collapsing of its own weight or expanding into infinity.
3, this homogeneous background dynamics is merely a Newtonian gravity model, with "dark energy" and "dark matter" used to pad out the critical density and mimic a uniform expansion.
For instance, virulent species may lie dormant in a host until they reach a critical density for releasing poisonous substances and resisting immune responses.
This recruiting map has two specific goals: to show the critical density of the telecom industry in San Diego and to promote San Diego's world renown California lifestyle.
A possibility is that the Hubble constant was much higher in the past leading to a higher critical density - cosmic inflation would still be necessary to overcome this issue.
The distant cluster also provides new evidence that the density of matter is lower than the so-called critical density, the value required to keep the universe flat.
In a flat universe, the total density of energy and matter must equal the so-called critical density.
For the universe to be flat, astronomers calculate that it must contain a critical density of material.
A universe with less than the critical density has a negative curvature and a shape akin to the seat of a saddle.

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