# density

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Related to densities: Population densities

## 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.
density, radiographic,
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

## Patient discussion about density

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.

More discussions about density
References in periodicals archive ?
Whether dead crow densities will be associated with the number of human cases in future years or other geographic areas is unknown.
The explanations for this pattern suggest three corollary hypotheses: virus "overwinters" in temperate rodent communities as persistent infections in older adult animals, which serve as a reservoir for reintroducing virus into susceptible young animals in the spring; spring antibody prevalence is a function of the population density (infectious and susceptible) the year before (the high fall population densities and higher spring antibody prevalence at the Colorado trapping webs in spring 1995 provide tentative support for this hypothesis); and deviations from typical environmental conditions alter the pattern of infection in potentially predictable directions.
The LGMR technology also allows for future increases in track densities by completely removing the servo tracks from the data side of the tape.
In this example we saw that the traditionally known facts, that compound viscosity can be altered by changes in plasticizer level or polymer type, and thereby affect sponge product densities.
A higher-output MP formulation, designated MP+++, was developed to handle the higher track densities of the DDS-4 format.
To increase areal densities in longitudinal recording, as well as increase overall storage capacity, the data bits on a disc must be made smaller and put closer together.
Women whose mammograms showed over 65 percent dense tissue developed breast cancer at a rate more than 400 percent higher than that of women with densities of less than 5 percent.
Another alternative to DMFC is the direct formic acid fuel cell (DFAFC) technology that has the potential to offer five to six times higher power densities.
Future I/O-intensive applications will require higher access densities than are indicated by the current development roadmaps.
Line of modular infrared heating devices (SpotIR, LineIR, StripIR, PanelIR, ChambIR, Hi-TempIR, and SimulateIR) produce heat flux densities ( -3 watts/[in.
for at least five years and compared their bone densities with those of age- and weight-matched women not on the hormone.
TOKYO -- New Devices Allow More Densities and Options to Stack with Other Semiconductors in Multi-Chip and System-in-Package Designs

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