Charge Density

In electromagnetism, charge density is a measure of electric charge per unit volume of space, in one, two or three dimensions. More specifically: the linear, surface, or volume charge density is the amount of electric charge per unit length, surface area, or volume, respectively. The respective SI units are C·m−1, C·m−2 or C·m−3.

Like any density, charge density can depend on position, but because charge can be negative - so can the density. It should not be confused with the charge carrier density, the number of charge carriers (e.g. electrons, ions) in a material per unit volume, not including the actual charge on the carriers.

In chemistry, it can refer to the charge distribution over the volume of a particle; such as a molecule, atom or ion. Therefore, a lithium cation will carry a higher charge density than a sodium cation due to the lithium cation's having a smaller ionic radius, even though sodium has more electrons (11) than lithium (3).

Read more about Charge DensityFree, Bound and Total Charge, Homogeneous Charge Density, Discrete Charges, Relative Charge Density, Charge Density (quantum Mechanics), Application

Other articles related to "charge density, charge, density, charges":

Charge Density - Application
... The charge density appears in the continuity equation for electric current, also in Maxwell's Equations ... source term of the electromagnetic field, when the charge distribution moves this corresponds to a current density ...
Diatomic Carbon - Charge Density
... “hump” occurs at the bond site in the charge density ... However, the singlet state of C2 acts more like silicon or germanium that is, the charge density has a maximum at the bond site ...
Antenna Equivalent Radius - Derivation
... varies along the conductor's length, charge is uniformly distributed along its circumference (owing to the skin effect) and the electric field is perpendicular to the surface ... Furthermore, only the charge in a neighborhood around any point on the conductor significantly contributes to the electric potential at that point ... the geometry is, effectively, one of an infinitely long conductor with a constant surface charge density (charge per area), thereby reducing a three-dimensional problem to a two-dimensional one ...
Physical Origins of Surface Stress
... For illustration, figure 1 shows a simple picture of bond charges near the surface of a 2-dimensional crystal with charge (election) density around sphere atoms ... The loss of neighbors which results from the creation of a metal surface reduces the local electron density around the atoms near the surface ... Surface atoms then sit in a lower average electron density than bulk atoms ...
Charge Conservation - Formal Statement of The Law
... Continuity equation Vector calculus can be used to express the law in terms of charge density ρ (in coulombs per cubic meter) and electric current density J (in amperes per ... The term on the right is the divergence of the current density J ... equation equates these two factors, which says that the only way for the charge density at a point to change is for a current of charge to flow into or out of the point ...

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