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Number density information


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.

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Number density

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volumetric number density, two-dimensional areal number density, or one-dimensional linear number density. Population density is an example of areal number density...

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Density

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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...

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Area density

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The area density (also known as areal density, surface density, superficial density, areic density, mass thickness, column density, or density thickness)...

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Density of air

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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...

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Particle number

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particle number density (or particle number concentration PNC), a quantity of kind volumetric number density obtained by dividing the particle number of a...

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Charge density

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is to clarify that the density is for electric charge, not other densities like mass density, number density, probability density, and prevent conflict...

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List of countries and dependencies by population density

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This is a list of countries and dependencies ranked by population density, sorted by inhabitants per square kilometre or square mile. The list includes...

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Bulk density

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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...

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Population density

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in low population densities are: Increased problems with locating sexual mates Increased inbreeding Population density is the number of people per unit...

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Probability density function

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In probability theory, a probability density function (PDF), density function, or density of an absolutely continuous random variable, is a function whose...

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Transistor count

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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...

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Spectral density

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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...

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Current density

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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...

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Linear density

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defined as the mass in grams per 10,000 meters Density Columnar density Paper density Linear number density Patt, D.H. (1958). "Findings and Recommendations...

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Pixel density

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(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)...

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Nuclear density

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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...

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Absorbance

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units), its shade number would be 8. Absorptance Tunable Diode Laser Absorption Spectroscopy (TDLAS) Densitometry Neutral density filter Mathematical...

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List of cities proper by population density

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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...

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Density of states

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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...

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Bone density

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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...

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Physiological density

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physiological density or real population density is the number of people per unit area of arable land. A higher physiological density suggests that the...

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Avogadro constant

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estimating the number of particles in a given volume of gas. This value, the number density n0 of particles in an ideal gas, is now called the Loschmidt constant...

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Lexical density

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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...

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Vapour density

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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...

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Natural density

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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...

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Urban density

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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...

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Kinetic theory of gases

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have uniform number densities, but the upper region has a higher number density than the lower region. In the steady state, the number density at any point...

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Fermi gas

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in a Fermi gas in thermal equilibrium, and is characterized by their number density, temperature, and the set of available energy states. The model is named...

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