The electrostatic system of units (ESU) has the centimeter, gram, second, and franklin as its base units, where the franklin is energy-equivalent to the unit square root dyne centimeter ($\frac{{\mathrm{cm}}^{\raisebox{1ex}{$3$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}\sqrt{g}}{s}$). For naming consistency, the franklin is called the abcoulomb.

When used in conjunction with the UseSystem command, the electrostatic system sets the following units for the given dimensions.

$\mathrm{convert}\left(1\,'\mathrm{units}'\,\frac{\mathrm{sqrt}\left('\mathrm{dyne}'\right)'\mathrm{centimeter}'}{'\mathrm{second}'}\,'\mathrm{statampere}'\,'\mathrm{energy}'\right)$

$1$

$\mathrm{convert}\left(1\,'\mathrm{units}'\,\mathrm{sqrt}\left('\mathrm{dyne}'\right)'\mathrm{centimeter}'\,'\mathrm{statcoulomb}'\,'\mathrm{energy}'\right)$

$1$

$\mathrm{convert}\left(1\,'\mathrm{units}'\,\frac{{'\mathrm{cm}'}^{\frac{3}{2}}{'g'}^{\frac{1}{2}}}{'s'}\,'\mathrm{statcoulomb}'\,'\mathrm{energy}'\right)$

$1$

$\mathrm{infolevel}\left[\mathrm{Units}\right]≔1\:$

$\mathrm{convert}\left(1.28523\,'\mathrm{system}'\,'W'\,'\mathrm{ESU}'\right)$

convert/system:   "converting to the units erg/s"

$1.285230000\times {10}^7$

$\mathrm{convert}\left(5.2324932\,'\mathrm{system}'\,'\mathrm{mho}'\,'\mathrm{ESU}'\right)$

convert/system:   "converting to the units statS"

$4.702730361\times {10}^{12}$

$\mathrm{unassign}\left('\mathrm{infolevel}\left[\mathrm{Units}\right]'\right)$

$\mathrm{with}\left(\mathrm{Units}\left[\mathrm{Standard}\right]\right)\:$

$\mathrm{Units}\left[\mathrm{UseSystem}\right]\left('\mathrm{ESU}'\right)$

To enter a unit in 2-D Math input, select the unit from the appropriate Units palette. If the unit you want is not there, select $\mathrm{unit}$ and then enter the unit.

When you edit a unit, double brackets appear around it.

$5\mathrm{Unit}\left(\frac{'\mathrm{kg}''m'}{'s'}\right)$

$5⟦\frac{\mathrm{kg}m}{s}⟧$

$\mathrm{combine}\left(\,'\mathrm{units}'\right)$

$500000⟦\frac{g\mathrm{cm}}{s}⟧$

$\frac{\mathrm{Unit}\left('s'\right)}{}$

$500000⟦\mathrm{dyn}⟧$

$\frac{{\mathrm{Unit}\left('\mathrm{cm}'\right)}^2}{}$

$500000⟦\mathrm{barye}⟧$