The surface
charge density s  so defined ignores the quantisation of charge and the
discontinuity in charge distribution at the microscopic level* s  represents
macroscopic surface charge density, which in a sense, is a smoothed out
average of the microscopic charge density over an area element DS which,
as said before, is large microscopically but small macroscopically The
units for s are C/m2 Similar considerations apply for a line charge distribution and a volume
charge distribution