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.

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units_of_measurement_cgs · basic_cgs_units · esu_units · emu_units · electrostatic_cgs_units · magnetic_cgs_units · centimetre_gram_second_units

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jednostki_miar_cgs · jednostki_podstawowe_cgs · jednostki_esu · jednostki_emu · elektrostatyczne_jednostki_cgs · magnetyczne_jednostki_cgs · jednostki_centymetr_gram_sekunda

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