Units of measurement table in centimetre-gram-second system (CGS)
Table shows various units (gal, erg, dyne etc.) and corresponding physical quantities (measurements) used in historical CGS (centimetre-gram-second) system. Both basic CGS and EMU/ESU extensions are presented.

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# Basic CGS units#

 Physical quantity CGS unit symbol CGS unit name Equivalent in SI units Length Show source$cm$ centimetre Show source$10^{-2}\ m$ Mass Show source$g$ gram Show source$10^{-3}\ kg$ Time Show source$s$ second Show source$1\ s$ Velocity Show source$\frac{cm}{s}$ centimetre per second Show source$10^{-2}\ \frac{m}{s}$ Acceleration Show source$Gal$ gal Show source$10^{-2}\ \frac{m}{s^2}$ Force Show source$dyn$ dyne Show source$10^{-5}\ N$ Energy Show source$erg$ erg Show source$10^{-7}\ J$ Power Show source$\frac{erg}{s}$ erg per second Show source$10^{-7}\ W$ Pressure Show source$Ba$ barye Show source$10^{-1}\ Pa$ Dynamic viscosity Show source$P$ poise Show source$10^{-1}\ Pa \cdot s$ Kinematic viscosity Show source$St$ stokes Show source$10^{-4}\ \frac{m^2}{s}$ Wavenumber Show source$cm^{-1}$ kayser Show source$100\ m^{-1}$

# ESU units (electrostatic)#

 Physical quantity CGS unit symbol CGS unit name Equivalent in SI units Electric charge Show source$statC$ statcoulomb Show source$\frac{10}{c} C$ Electric flux Show source$statC$ statcoulomb Show source$\frac{1}{4\pi \cdot c}\ V \cdot m$ Electric current Show source$statA$ statampere Show source$10\ A$ Electric potential Show source$statV$ statvolt Show source$10^{-8}\ c\ V$ Electric field Show source$\frac{statV}{cm}$ statvolt per centimetre Show source$10^{-6}\ c\ \frac{V}{m}$ Electric displacement field Show source$\frac{statC}{cm^2}$ statcoulomb times square centimetre Show source$10^{5}\ c^{-1} \frac{C}{m^2}$ Electric dipole moment Show source$statC \cdot cm$ statcoulomb times centimetre Show source$\frac{1}{10 c}\ C \cdot m$ Magnetic dipole moment Show source$statA \cdot cm^2$ statampere times square centimetre Show source$\frac{1}{1000 c}\ A \cdot m^2$ Magnetic B field Show source$statT$ stattesla Show source$10^{-4}\ c\ T$ Magnetic H field Show source$\frac{statA}{cm}$ statampere per centimetre Show source$\frac{1000}{4\pi\ c}\ \frac{A}{m}$ Magnetic flux Show source$statWb$ statwebber Show source$10^{-8}\ c\ Wb$ Resistance Show source$\frac{s}{cm}$ second per centimetre Show source$10^{-9}\ c^2\ \frac{s}{cm}$ Resistivity Show source$s$ second Show source$10^{-11}\ c^2\ \Omega \cdot m$ Capacitance Show source$cm$ centimetre Show source$10^{9}\ c^{-2}\ F$ Inductance Show source$\frac{s^2}{cm}$ square second per centimetre Show source$10^{-9}\ c^2\ H$

# EMU units (electromagnetism)#

 Physical quantity CGS unit symbol CGS unit name Equivalent in SI units Electric charge Show source$abC$ abcoulomb Show source$10\ C$ Electric flux Show source$abC$ abcoulomb Show source$10\ V \cdot A$ Electric current Show source$abA$ abampere Show source$10\ A$ Electric potential Show source$abV$ abvolt Show source$10^{-8}\ V$ Electric field Show source$\frac{abV}{cm}$ abvolt per centimetre Show source$10^{-6}\ \frac{V}{m}$ Electric displacement field Show source$\frac{abC}{cm^2}$ abcoulomb per square centimetre Show source$10^{5}\ \frac{C}{m^2}$ Electric dipole moment Show source$abC \cdot cm$ abcoulomb times centimetre Show source$10^{-1}\ C \cdot m$ Magnetic dipole moment Show source$abA \cdot cm^2$ abampere times square centimetre Show source$10^{-3}\ A \cdot m^2$ Magnetic B field Show source$G$ gauss Show source$10^{-4}\ T$ Magnetic H field Show source$Oe$ oersted Show source$\frac{1000}{4 \pi}\ \frac{A}{m}$ Magnetic flux Show source$Mx$ maxwell Show source$10^{-8}\ Wb$ Resistance Show source$ab\Omega$ abohm Show source$10^{-9}\ \Omega$ Resistivity Show source$ab\Omega \cdot cm$ abohm times centimetre Show source$10^{-11}\ \Omega \cdot m$ Capacitance Show source$abF$ abfarrad Show source$10^{9}\ F$ Inductance Show source$abH$ abhentry Show source$10^{-9}\ H$

# Some facts#

• CGS (centimetre-gram-second) is the historical system of units used in physics before the spread of the SI system.
• The basic units in the CGS system are one centimetre (1 cm), one gram (1 g) and one second (1 s). The short name CGS comes from the names of these units.
• Other units of the CGS system are derived from basic units, e.g. the force unit in the CGS system is one dyne (1 dyn):
$1 dyn = \frac{g \cdot cm^2}{s^2}$
• The disadvantage of the CGS system is the lack of units related to electricity and magnetism. For this reason extensions of the CGS system were created:
• ESU (electrostatic units) - extension of the CGS system by units come from electrostatics (electrical charges at rest), units from this extension have the stat prefix, e.g. statampere is a unit of electric current in the ESU-CGS system,
• EMU (electromagnetic units) - extension of the CGS system by units come from electrodynamics (electric charges in motion), units from this extension have the ab prefix, e.g. abvolt is the unit of electric voltage in the EMU-CGS system.
• The CGS has been displaced by SI units and is no longer in use.