Charge density.

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Offline hamza

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Charge density.
« on: 10/09/2007 17:26:30 »
What relations does charge density have with the mass, charge and size of a particl. and what does it atually mean when we talk about charge denity..


Offline DrDick

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Charge density.
« Reply #1 on: 11/09/2007 17:06:09 »
Regular density can be thought of as mass density - in other words how much mass is found in a particular region of space (volume).  More dense things pack in more mass in an equivalent volume, or take up less space for an equivalent volume.

Charge density takes the same concept, but replaces mass with charge.  (Mass doesn't directly affect charge density.)  So, high charge density results from having a high charge in a small volume.  For instance, if you have two ions of the same size (volume), but with different charge (e.g., +1 vs. +2), the higher species with the larger charge has a higher charge density.  Or, give the same charge (e.g., +1) but different sizes (think Na+1 vs. K+1), the smaller ion has a higher charge density.