density

(redirected from packing density)
Also found in: Dictionary, Thesaurus, Financial, Encyclopedia, Wikipedia.

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

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

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]

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 ?
Next, the sample section is removed and a precise mass of ash is added to the wafer giving an expected packing density of 0.15 g/[cm.sup.3].
(3) Increasing the filtration velocity, particle layer is obviously compressed to result in the packing density increases rapidly in the low filtration velocity and then starts to slow down the increment rate when the velocity is larger than about 0.1 m/s.
We start by presenting the original Price's Algorithm to compute a lower bound for the packing density of a layered permutation.
A similar behavior was observed for both inhibition calculation methods, with highly significant and positive correlation coefficients for the degree of swelling (0.979) and packing density (0.953), which corresponds to an increase in inhibition when the fibers have high values of these properties.
Applications of stereological techniques along with advanced packing density theory on European hake (Merluccius merluccius L.).
Terminated packing density of a particle layer is small compared to that of a larger strain condition.
Airborne [PM.sub.10] endotoxin concentrations were significantly affected by animal (poultry or swine), animal operation type, animal packing density, and indoor air humidity.
The reason for this change is that the packing density of the FCC case is maximum (0.74), which basically means the higher ratio of metal particles in the matrix thereby increasing the effective constitutive properties.
It is clearly seen in Figure 6(b) that the average enhancement factor intensively changes with molecule packing density on the substrate at high molecular concentration.
One of the key drivers behind the proposed adoption of the HD-BNC is to greatly increase the packing density. To this end, the system is sold with an insertion tool, which allows the bayonet lock to be made without the need to get your fingers around the plug, meaning that the connectors can be very close together.
This method increases mixing and packing density and can be used to fill containers.
By developing a technology that increases the propensity to shear thin, the material will be more capable of flowing into ultra fine apertures, thus increasing the packing density and improving wetting to the substrate.