The number density (symbol: n or ρN) is an intensive quantity used to describe the degree of concentration of countable objects (particles, molecules, phonons, cells, galaxies, etc.) in physical space: three-dimensional volumetric number density, two-dimensional areal number density, or one-dimensional linear number density. Population density is an example of areal number density. The term number concentration (symbol: lowercase n, or C, to avoid confusion with amount of substance indicated by uppercase N) is sometimes used in chemistry for the same quantity, particularly when comparing with other concentrations.
volumetric numberdensity, two-dimensional areal numberdensity, or one-dimensional linear numberdensity. Population density is an example of areal number density...
Density (volumetric mass density or specific mass) is a substance's mass per unit of volume. The symbol most often used for density is ρ (the lower case...
The area density (also known as areal density, surface density, superficial density, areic density, mass thickness, column density, or density thickness)...
The density of air or atmospheric density, denoted ρ, is the mass per unit volume of Earth's atmosphere. Air density, like air pressure, decreases with...
particle numberdensity (or particle number concentration PNC), a quantity of kind volumetric numberdensity obtained by dividing the particle number of a...
is to clarify that the density is for electric charge, not other densities like mass density, numberdensity, probability density, and prevent conflict...
This is a list of countries and dependencies ranked by population density, sorted by inhabitants per square kilometre or square mile. The list includes...
In materials science, bulk density, also called apparent density, is a material property defined as the mass of the many particles of the material divided...
in low population densities are: Increased problems with locating sexual mates Increased inbreeding Population density is the number of people per unit...
In probability theory, a probability density function (PDF), density function, or density of an absolutely continuous random variable, is a function whose...
chip. The transistor density is the number of transistors that are fabricated per unit area, typically measured in terms of the number of transistors per...
is finite, one may compute the energy spectral density. More commonly used is the power spectral density (or simply power spectrum), which applies to signals...
electromagnetism, current density is the amount of charge per unit time that flows through a unit area of a chosen cross section. The current density vector is defined...
defined as the mass in grams per 10,000 meters Density Columnar density Paper density Linear numberdensity Patt, D.H. (1958). "Findings and Recommendations...
(dimension) and a pixel density (ppi). Since most digital hardware devices use dots or pixels, the size of the media (in inches) and the number of pixels (or dots)...
Nuclear density is the density of the nucleus of an atom. For heavy nuclei, it is close to the nuclear saturation density n 0 = 0.15 ± 0.01 {\displaystyle...
units), its shade number would be 8. Absorptance Tunable Diode Laser Absorption Spectroscopy (TDLAS) Densitometry Neutral density filter Mathematical...
the city limits of the city. The population density of the cities listed is based on the average number of people living per square kilometer or per...
matter physics, the density of states (DOS) of a system describes the number of allowed modes or states per unit energy range. The density of states is defined...
Bone density, or bone mineral density, is the amount of bone mineral in bone tissue. The concept is of mass of mineral per volume of bone (relating to...
physiological density or real population density is the number of people per unit area of arable land. A higher physiological density suggests that the...
estimating the number of particles in a given volume of gas. This value, the numberdensity n0 of particles in an ideal gas, is now called the Loschmidt constant...
density is to compute the ratio of lexical items to the total number of words. Another method is to compute the ratio of lexical items to the number of...
molecular weights are divided by this number to derive their vapour density. For example, acetone has a vapour density of 2 in relation to air. That means...
In number theory, natural density, also referred to as asymptotic density or arithmetic density, is one method to measure how "large" a subset of the set...
Urban density is a term used in urban planning and urban design to refer to the number of people inhabiting a given urbanized area. As such it is to be...
have uniform numberdensities, but the upper region has a higher numberdensity than the lower region. In the steady state, the numberdensity at any point...
in a Fermi gas in thermal equilibrium, and is characterized by their numberdensity, temperature, and the set of available energy states. The model is named...