# density

## Definitions

• WordNet 3.6
• n density the amount per unit size
• n density the spatial property of being crowded together
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Webster's Revised Unabridged Dictionary
• Interesting fact: Airports that are at higher altitudes require a longer airstrip due to lower air density
• Density (Photog) Depth of shade.
• Density The quality of being dense, close, or thick; compactness; -- opposed to rarity.
• Density (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.
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Century Dictionary and Cyclopedia
• Interesting fact: At its center, the sun has a density of over a hundred times that of water, and a temperature of 10-20 million degrees Celsius.
• n density The quality of being dense, close, or compact; closeness of constituent parts; compactness, actual or relative.
• n density The mass or amount of matter per unit of bulk. The mass is the ratio of the living force or double the energy of motion to the square of the velocity. Experiments made by Newton upon the effect of attaching masses of different materials to pendulums have shown that the weights of bodies are precisely proportionate to their masses; consequently, the density is measured by the specific gravity, or the weight of a unit bulk. The unit of density is generally taken as that of water at its temperature of maximum density (4° C., 39° F.) and under ordinary pressure. Inasmuch as the gram was intended to be, and within the limits of the probable error of the best observations actually is, the mass of one cubic centimeter of water under these conditions, it is follows that the density as ordinarily expressed is, as closely as possible, the number of grams in one cubic centimeter of the particular kind of matter in question. The following table show the density of several important substances: iridium, 22.4; platinum, 21.4; gold, 19.3; liquid mercury, 13.6; lead, 11.3; silver, 10.5; copper, 8.9; nickel, 8.7; iron, 7.8; tin, 7.3; zinc, 7.2; the earth, 5.6; solution of iodides of mercury and potassium, 3.2; diamond, 3.5; rock, about 2.7; aluminium, 2.6; sulphur, 2.0; magnesium, 1.7; the human body, 1.1; india-rubber, 1.0; alcohol, 0.8; ether, 0.7; lithium, 0.6; vapor of iodide of arsenic, 1.02; air, 0.0013; aqueous vapor, 0.0008; hydrogen, 0.00009. See specific gravity, under gravity.
• n density In electricity, the quantity of electricity per unit of volume at a point in space, or the quantity of electricity per unit of area at a point on a surface.
• n density In photography, opacity of the developed film of a negative.
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Chambers's Twentieth Century Dictionary
• Interesting fact: The planet Saturn has a density lower than water. If there was a bathtub large enough to hold it, Saturn would float.
• Density the quality of being dense: the proportion of mass to bulk or volume: the quantity of matter per unit of bulk
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## Etymology

Webster's Revised Unabridged Dictionary
L. densitas,; cf. F. densité,
Chambers's Twentieth Century Dictionary
L. densus, thick.

## Usage

### In literature:

The density of the thread is from 1.5 to 1.55.
"Researches on Cellulose" by C. F. Cross
Or it is steam which is at the maximum pressure and density possible at its temperature.
"Steam, Its Generation and Use" by Babcock & Wilcox Co.
Great latitude is permissible in the strength of solution and density of current.
"On Laboratory Arts" by Richard Threlfall
The outlines of all objects round her were clear and hard: everything had assumed a look of preternatural density.
"Sacrifice" by Stephen French Whitman
To compute the thrust stresses, I had to know the density of the contents of Cargo Hold One.
"Unwise Child" by Gordon Randall Garrett
The snow-storm increasing in density, they at length lost sight of their companions.
"Archibald Hughson" by W.H.G. Kingston
Again, it may be modified in density or constituents.
"Special Report on Diseases of the Horse" by United States Department of Agriculture
The amount of pressure upon the clay in moulding also affects the density and porosity of tiles.
"Farm drainage" by Henry Flagg French
What degree of density can be attained?
"The Problems of Psychical Research" by Hereward Carrington
The snowfall grew in weight and density.
"The Heart of Unaga" by Ridgwell Cullum
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### In poetry:

LOCATIONS and times—what is it in me that meets them all, whenever
and wherever, and makes me at home?
Forms, colors, densities, odors—what is it in me that corresponds
with them?
"Locations And Times" by Walt Whitman
Then when the flame forked like a sudden path
I gasped and stumbled, and was less.
Density pulsing upward, gauze of ash,
Dear light along the way to nothingness,
What could be made of you but light, and this?
"Log" by James Merrill

### In news:

Development is to include higher-density buildings such as the Broadway Tech Centre at Broadway and Renfrew.
A rezoning request has opened the door to criticism about the way the city determines density for housing developments.
Accuracy of Micro Motion density meter removes need for expensive coating additives, enabling significant annual savings.
Density meter improves quality for Cartier Del Garda paper mill.
The project will develop biocompatible hermetic coatings, high density ceramic feed-throughs, and hermeticity test chips for biomedical microsystems applications.
Harry Hurst Gummy Bear Density experiment.
XP Power announced today two additions to its range of ultra compact high power density AC-DC power supplies.
It seems that our exceedingly dry early summer dramatically reduced the extent and density of flowers and the abundance of flower-visiting insects.
This one has a big cam, under drive pulley, nitrous, and a speed density tune to ensure every last ounce of power is being squeezed from it.
In our plastics reclaiming plant, we use high density salt water solutions to separate plastic by specific gravity.
The flexible nylon shell features a high-density, 13-gauge, seamless machine-knit construction.
The nylon shell is lightweight and flexible, featuring a high-density, 13-gauge, seamless machine knit construction.
Compact Module with Linear Motor Delivers High Force Density.
The second compression provides for uniform density of each block.
Advanced Lighting Concept – Neutral Density Filters.
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### In science:

We can identify three regimes of this dynamics, ﬁrst a very fast increase of the density up to a density ρ0 , then the slow compaction regime which takes the density up to ρ∞ , and ﬁnally an asymptotic regime.
On random graphs and the statistical mechanics of granular matter
In order to consider the connection of the density of scattering points in random walk to the physical number density, let us introduce the concept of the staying time density.
Application of random walk theory to the first order Fermi acceleration in shock waves
We consider in this section the probability density functions for a spherical n-ball having an arbitrary density characterized by a density function ρ.
Random Distance Distribution for Spherical Objects: General Theory and Applications to n-Dimensional Physics
Because superﬂuidity is described by the two ﬂuid model, the particle density n consists of the normal ﬂuid density nn and the superﬂuid density ns .
Bose-Einstein condensation and superfluidity of dilute Bose gas in a random potential
For example, in the interacting electron system, fractionalization possibly occurs at intermediate values of density somewhere between the extreme low density Wigner crystal and the high density Fermi liquid regimes.
Exotic order in simple models of bosonic systems
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