# 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 ?
In (4), [v.sub.f,i] is free flow speed and [[rho].sub.c,i] represents critical density, which is the density associated with capacity.
In our model the DE density equals the critical density reduced by the ratio of the squares of the Hubble and event horizons radii (24), having the value in good agreement with the observational data.
According to the Planck mission (PM) 2015 results [10], it seems that the universe has critical density:
In the LWR model the characteristic speed vanishes exactly at the critical density where the traffic flow changes from free flow to congested flow.
We define [[rho].sub.c] as the critical density, corresponding to the microvilli so dense that they form a new surface inside the vessel walls (Figure 4).
In [28], Gilbert firstly raised the concept of continuum percolation to find the critical density of a Poisson point process.
One can observe that the network speed is greatly influenced by the maximum vehicle speed when the network density is lower than a critical density. However, the influence will be weak when the network density exceeds the critical density.
At CMB both temperature and density of C[H.sub.4] are, respectively, 4000[degrees]C and 8.8 g/[cm.sup.3] while critical density is 0.162 g/[cm.sup.3] and critical temperature is only 48[degrees]C.
Quorum sensing allows bacteria to change their behaviour after reaching a critical density. For example, at high densities, the bacterium Vibrio fischeri, which lives on the skin of squid, starts glowing, helping to camouflage the squid, but V.
Finally, we will demonstrate that there are graph classes such that there a exists a critical density co where the category to which a random graph with cn edges belongs to is different for c > [c.sub.o] and c < [c.sub.o].
Although many of the essays in this collection rehearse ideas or theoretical assumptions that we are familiar with from postcolonial and British cultural studies, by recasting these ideas and assumptions via new or different texts and contexts they expand the persuasive force and critical density of the scholarship to which they are themselves indebted.
It has been suggested that branching is induced when the concentration of tip growth vesicles reaches a critical density at the apex (Trinci 1974).

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