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Column number density is a kind of areal density, the number or count of a substance per unit area, obtained integrating volumetric number density along a vertical path: ′ =. It's related to column mass density, with the volumetric number density replaced by the volume mass 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 Greek letter rho), although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume: [1] where ρ is the density, m is the mass, and V is the volume.
As in the previous section, the number density is defined as the number of molecules per (extensive) volume, or = /. The collision cross section per volume or collision cross section density is n σ {\displaystyle n\sigma } , and it is related to the mean free path l {\displaystyle l} by l = 1 n σ 2 {\displaystyle l={\frac {1}{n\sigma {\sqrt ...
The Loschmidt constant or Loschmidt's number (symbol: n0) is the number of particles (atoms or molecules) of an ideal gas per volume (the number density), and usually quoted at standard temperature and pressure. The 2018 CODATA recommended value [1] is 2.686 780 111... × 1025 m−3 at 0 °C and 1 atm. It is named after the Austrian physicist ...
Molar volume. In chemistry and related fields, the molar volume, symbol Vm, [1] or of a substance is the ratio of the volume (V) occupied by a substance to the amount of substance (n), usually at a given temperature and pressure. It is also equal to the molar mass (M) divided by the mass density (ρ): The molar volume has the SI unit of cubic ...
In it he derived the relation = ¯ / for the pressure, , in a gas with particles per unit volume (number density), mass , and mean square speed ¯. He then noted that using the classical laws of Boyle and Charles one could write m v 2 ¯ / 3 = k T {\displaystyle m{\overline {v^{2}}}/3=kT} with k {\displaystyle k} a constant of proportionality.
Molar concentration (also called molarity, amount concentration or substance concentration) is a measure of the concentration of a chemical species, in particular, of a solute in a solution, in terms of amount of substance per unit volume of solution. In chemistry, the most commonly used unit for molarity is the number of moles per liter ...
n(r, t) is the number of particles per unit volume ("number density") (SI unit: m −3); q is the charge of the individual particles with density n (SI unit: coulombs). A common approximation to the current density assumes the current simply is proportional to the electric field, as expressed by: =