# density

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## density

[den´sĭ-te]
1. the ratio of the mass of a substance to its volume.
2. the quality of being compact.
3. the quantity of matter in a given space.
4. the quantity of electricity in a given area, volume, or time.
5. the degree of film blackening in an area of a photograph or radiograph.

## den·si·ty (ρ),

(den'si-tē),
1. The compactness of a substance; the ratio of mass to unit volume, usually expressed as g/cm3 (kg/m3 in the SI).
2. The quantity of electricity on a given surface or in a given time per unit of volume.
3. radiologic physics the opacity to light of an exposed radiographic or photographic film; the darker the film, the greater will be the measured density.
4. clinical radiology a less exposed area on a film, corresponding to a region of greater x-ray attenuation (radiopacity) in the subject; the more light transmitted by the film, the greater the density of the subject will be; this is not actually the opposite of sense 3, because one concerns film density and the other subject density.
[L. densitas, fr. densus, thick]

## density

/den·si·ty/ (den´sit-e)
1. the quality of being compact or dense.
2. quantity per unit space, e.g., the mass of matter per unit volume. Symbol d.
3. the degree of darkening of exposed and processed photographic or x-ray film.

## density (D)

[den′sitē]
Etymology: L, densus, thick
1 the amount of mass of a substance in a given volume. The greater the mass in a given volume, the greater the density. See also mass, volume.
2 (in radiology) the degree of x-ray film blackening.

## density

The amount of a substance per unit volume Imaging
1. The compactness in a scan which reflects the type of tissues seen in CT and MR scans.
2. The amount of 'hard' or mineralized tissue in a plain film. See Bone mineral, Current density, Muscle fiber density, Spin density, Vapor density.

## den·si·ty

, pl. densities (dens'i-tē, -tēz)
1. The compactness of a substance; the ratio of mass to unit volume, usually expressed as g:cm3 (kg:m3 in SI).
2. The quantity of electricity on a given surface or in a given time per unit of volume.
3. radiologic physics The opacity to light of an exposed radiographic or photographic film; the darker the film, the greater the measured density.
4. clinical radiology A less-exposed area on a film, corresponding to a region of greater x-ray attenuation (radiopacity) in the subject; the more light transmitted by the film, the greater the density of the subject; this is not actually the opposite of the sense 3 definition, because one concerns film density and the other subject density.
[L. densitas, fr. densus, thick]

## density

the ratio of mass to volume. Measured in kilograms per cubic metre (kg.m-3).

## density

An indication of the compactness of a substance. It is expressed as the ratio of the mass of the substance to its unit volume. The common units are g/cm3 and kg/m3. This property is usually given by lens manufacturers, the greater the density of a material, the greater its weight, all other factors being equal.

## den·si·ty

, pl. densities (dens'i-tē, -tēz)
1. Compactness of a substance.
2. Quantity of electricity on a given surface or in a given time per unit of volume.
3. radiologic physics opacity to light of an exposed radiographic or photographic film; the darker the film, the greater the measured density.
4. clinical radiology a less exposed area on a film, corresponding to a region of greater x-ray attenuation (radiopacity) in the subject.
[L. densitas, fr. densus, thick]

## density,

n the concentration of matter, measured by mass per unit volume.
n the degree of darkening of exposed and processed photographic or radiographic film, expressed as the logarithm of the opacity of a given area of the film.

## density

1. the ratio of the mass of a substance to its volume.
2. the quality of being compact.
3. the quantity of matter in a given space.
4. the quantity of electricity in a given area, volume or time.
5. the degree of film blackening in an area of a photograph or radiograph.

population density
number of animals per unit of area; important in relation to the rate of spread of disease.
density sampling

Q. what are the sources for high density lipoprotein? I have heard that high density lipoprotein is good for heart. What differences does it make in heart’s health and what are the sources for high density lipoprotein?

A. Hi Liam, it is very important that we have high density lipoprotein (HDL) in our body. The fact is that the HDL is formed inside the body. They are known as good cholesterol as they are famous for their protection for heart against the heart diseases. It has been found that Vitamin B3 or Niacin consumption increases the count of HDL. It’s good to cut on the diet having more of saturated fats and oils, which increases the chances of heart attack.

References in periodicals archive ?
Denser connective tissue in theory provides increased joint stability, which can decrease pain stimuli.
Denser areas also have utilized most of the capacity of their existing infrastructure, meaning the congestion associated with the central city will directly increase a firm's fixed costs, prompting creation of jobs in less dense areas.
The human body is less dense than a sand-and-water mixture (quicksand is even denser than water
TENNISplayers have 30 per cent denser bones in their serving arm and runners have denser bones in their spine -proving that bone needs weight- bearing exercise to maintain strength.
Also, the leaf used to wrap bidis is denser than paper, thus smokers must inhale more deeply and more frequently to keep a bidi lit.
But more radiation may be needed to create an image of the denser breast tissue of younger women.
Without any capacitor, it is denser than conventional one-transistor, one-capacitor DRAM, which is used extensively in modern computers' main memory.
As future chips become denser still, it will become more critical to avoid roughened silicon surfaces, says Hitohi Morinaga of Tohoku University in Sendai, Japan.
The full penetration ram provides denser bales with average bale weights of 6,813 pounds for #1 copper, 3,795 pounds for stainless steel, and 4,145 pounds for mixed insulated copper wire.
CANYON COUNTRY - Planning commissioners have approved a 499-unit Plum Canyon housing project that was denser than they liked, but with amenities they could not refuse.
While both Seattle and Portland are getting denser in downtown areas, Portland is getting much denser.
It's an "ugly mountain" of worldly burdens and source material--psychological, experiential, and art historical--and it grows denser and currier toward its lower strata, as with the weight of compression, or as if to evoke the subconscious.

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