Crossword clues for density
density
Longman Dictionary of Contemporary English
The Collaborative International Dictionary
Density \Den"si*ty\ (d[e^]n"s[i^]*t[y^]), n. [L. densitas; cf. F. densit['e].]
The quality of being dense, close, or thick; compactness; -- opposed to rarity.
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(Physics) The ratio of mass, or quantity of matter, to bulk or volume, esp. as compared with the mass and volume of a portion of some substance used as a standard.
Note: For gases the standard substance is hydrogen, at a temperature of 0[deg] Centigrade and a pressure of 760 millimeters. For liquids and solids the standard is water at a temperature of 4[deg] Centigrade. The density of solids and liquids is usually called specific gravity, and the same is true of gases when referred to air as a standard.
(Photog.) Depth of shade.
--Abney.
Douglas Harper's Etymology Dictionary
c.1600, from French densité (16c.), from Old French dempsité (13c.), from Latin densitas "thickness," from densus "thick, dense" (see dense).
Wiktionary
n. (senseid en physics: amount of matter contained by a given volume)(context physics English) A measure of the amount of matter contained by a given volume.
WordNet
n. the amount per unit size [syn: denseness]
the spatial property of being crowded together [syn: concentration, denseness, compactness] [ant: distribution]
Wikipedia
The density, or more precisely, the volumetric mass density, of a substance is its mass per unit volume. The symbol most often used for density is ρ (the lower case Greek letter rho), although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume:
$$\rho = \frac{m}{V},$$
where ρ is the density, m is the mass, and V is the volume. In some cases (for instance, in the United States oil and gas industry), density is loosely defined as its weight per unit volume, although this is scientifically inaccurate – this quantity is more specifically called specific weight.
For a pure substance the density has the same numerical value as its mass concentration. Different materials usually have different densities, and density may be relevant to buoyancy, purity and packaging. Osmium and iridium are the densest known elements at standard conditions for temperature and pressure but certain chemical compounds may be denser.
To simplify comparisons of density across different systems of units, it is sometimes replaced by the dimensionless quantity " relative density" or " specific gravity", i.e. the ratio of the density of the material to that of a standard material, usually water. Thus a relative density less than one means that the substance floats in water.
The density of a material varies with temperature and pressure. This variation is typically small for solids and liquids but much greater for gases. Increasing the pressure on an object decreases the volume of the object and thus increases its density. Increasing the temperature of a substance (with a few exceptions) decreases its density by increasing its volume. In most materials, heating the bottom of a fluid results in convection of the heat from the bottom to the top, due to the decrease in the density of the heated fluid. This causes it to rise relative to more dense unheated material.
The reciprocal of the density of a substance is occasionally called its specific volume, a term sometimes used in thermodynamics. Density is an intensive property in that increasing the amount of a substance does not increase its density; rather it increases its mass.
Density and dense usually refer to a measure of how much of some entity is within a fixed amount of space. Types of density include:
In geometry, the density of a polytope represents the number of windings of a polytope, particularly a uniform or regular polytope, around its center. It can be visually determined by counting the minimum number of facet or face crossings of a ray from the center to infinity. The density is constant across any continuous interior region of a polytope that crosses no facets. For a non-self-intersecting (acoptic) polytope, the density is 1.
Tessellations with overlapping faces can similarly define density as the number of coverings of faces over any given point.
Usage examples of "density".
And consequently, as the accidents are preserved by Divine power when the substance is withdrawn, so, when matter is withdrawn, the qualities which go with matter, such as rarity and density, are preserved by Divine power.
The Russian astrophysicist Shklovsky has calculated that a type II supernovae 32 light-years from the sun could bath the earth with cosmic rays having an energy density 100 times that of the cosmic rays that now impinge upon the atmosphere.
Soy Zone Diet, supplemented with lesser amounts of fruits, which are higher in carbohydrate density.
By adjusting the parameters that determined density, Gamow and his colleagues developed a model that within the first thirty minutes of the Bang yielded a composition close to that which was observed.
We are plunging nearer the Eater now, and a standard Gaussian distribution for the density of small, meteor-sized debris would predict that we shall receive strikes at an exponentiating rate.
The propulsion plant of the Kaliningrad was far superior to any other in the fleet, for that matter was much more advanced than anything the Americans had, with their low-power density, water-cooled cores.
She discovered that Ty knows how to produce a diamond gel with a density only ten times more than air, yet with a tensile strength of a thousand tons per square inch.
The radar was pointed down into the dirt, and returned echoes from lumps of differing density.
Varieties of light glanced off the surface borders of air and water, water and glass, glass and oil, the whole room a medium of nonuniform density, these propagating waves graining her body, soon to be rubbed and soaped and misted, transformed in displaceable mass, passing through itself, beauty bare, an unfalsifiable and self-blinding essence, not subject to the judgments of mirrors, what Euclid might have danced to in the summer dusk.
Next, I put some of the saliva through the centrifuge, just to be sure the parasites and the viruses did indeed separate out at different densities.
If we had more pods, if we could get a better salvo density, it might still make sense to go after them, first.
But each of those powders has a different inherent density, or weight.
HRT increases breast density, which reduces the sensitivity and specificity of breast screening.
The other planet, shortchanged on the denser elements, was able to settle into an orbit with its partner that would seem, to those unfamiliar with the physics and densities involved, to bring it dangerously close to Vulcan.
Looking up, in fact, it was impossible to see anything except green, and more green: galaxies of starbloom, riotous armies of orchids, fruits of every color, shape, composition, and degree of ripeness, all blurred and softened and hidden by the omnipresent density of the mist.