Number Density
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High Quality Content by WIKIPEDIA articles! In physics, astronomy, and chemistry, number density is an intensive quantity used to describe the degree of concentration of countable objects (particles, molecules, phonons, galaxies, copies of Physics World, etc.) in the three-dimensional physical space. Area number density (number of entities per unit surface area) and linear number density (number of entities per unit length) are defined analogously. The term number concentration (symbol: C) is sometimes used in chemistry for the same quantity, particularly when comparing with other…mehr

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High Quality Content by WIKIPEDIA articles! In physics, astronomy, and chemistry, number density is an intensive quantity used to describe the degree of concentration of countable objects (particles, molecules, phonons, galaxies, copies of Physics World, etc.) in the three-dimensional physical space. Area number density (number of entities per unit surface area) and linear number density (number of entities per unit length) are defined analogously. The term number concentration (symbol: C) is sometimes used in chemistry for the same quantity, particularly when comparing with other concentrations.Here it is assumed that N is large enough that rounding of the count to the nearest integer does not introduce much of an error, however V is chosen to be small enough that the resulting n does not depend much on the size or shape of the volume V.