Geometric Units

SI Defined Units
Quantity	Name	Symbol
length (distance)	meter	m
mass	kilogram	kg
time	second	s
temperature	Kelvin	K
current	Ampere	A
quantity	mole	mol
luminosity	candela	cd

SI Derived Units
Quantity	Name	Symbol	Units
frequency	Hertz	Hz	m-1
velocity	-	-	m s-1
acceleration	-	-	m s-2
force	Newton	N	kg m s-2
pressure (stress)	Pascal	Pa	N m-2 = kg m-1 s-2
energy (work, heat)	Joule	J	N m = kg m2 s-2
momentum (impulse)	-	-	N s = kg m s-1
power	Watt	W	J s -1 = kg m2 s-3
electric charge	Coulomb	C	A s
electric potential (emf)	Volt	V	J C-1 = W A -1 = kg m2 s-3 A-1
resistance	Ohm	W	V A-1 = kg m2 s-3 A-2
conductance	Siemens	S	A V-1 = W-1 = kg-1 m-2 s3 A2
magnetic flux	Weber	Wb	V s = kg m2 s-2 A -1
inductance	Henry	H	Wb A-1 = kg m2 s-2 A-2
capacitance	Farad	F	C V-1 = kg-1 m-2 s4 A2
electric field strength	-	-	V m-1 = N C-1
electric displacement	-	-	C m-2
magnetic field strength	-	-	A m-1
magnetic flux density	Tesla	T	Wb m-2 = N A-1 m-1 = kg s-2 A-1
plane angle	radian	rad	2p (circle)
solid angle	steradian	sr	4p (sphere)
luminous flux	lumen	lm	cd sr
illuminance	lux	lx	lm m-2

SI Accepted Units
Quantity	Name	Symbol	Units
length	Å ngstrom	Å, å	1 a = 10-10 m
volume	Liter	L, l	1 L = 10-3 m3
mass	metric ton	t	1 t = 1000 kg
pressure	bar	bar	1 bar = 105 Pa = 105 N m-2
time	minute	min	1 min = 60 sec
time	hour	h	1 h = 60 min = 3600 sec
time	day	d	1 d = 24 h = 86 400 s
plane angle	degree	o	1o = (p/180) rad
plane angle	minute	'	1' = (1/60)o = (p/10 800) rad
plane angle	second	"	1" = (1/60)' = (p /648 000) rad

Geometric Constants

Earth Constants
Constant	Symbol	Value
Standard Atmosphere	atm	101 325 Pa (exact)
Standard Acceleration of Gravity	ga	9.806 65 m s-2 (exact)
Astronomical Unit (Earth-Sun)	au	1.495 978 706 91 (30) ´ 1011 m

Universal Constants
Constant	Symbol	Value
Speed of Light in Vacuum	c	299 792 458 m s-1 (exact)
Permeability of Vacuum = 4p ´ 10-7 N/A2	mo	12.566 370 614 ... N A-2
Permittivity of Vacuum = 1/moc2	eo	8.854 187 817 ... ´ 10-12 F m-1
Newtonian Constant of Gravitation	G	6.672 59 (85) ´ 10-11 m3 kg -1 s-2
electron Volt (in Joules)	eV	1.602 177 33 (49) ´ 10 -19 J
(unified) atomic mass unit = m( 12C)/12	u	1.660 540 2 (10) ´ 10-27 kg

Planck Constants
Constant	Symbol	Value
Planck Constant	h	6.626 075 5 10 (40) ´ 10-34 J s
Planck Constant = h/{e} (in electron Volts)	h/{e }	4.135 669 2 (12) ´ 10-15 eV s
Planck Constant = h/2p	h	1.054 572 66 (63) ´ 10-34 J s
Planck Constant = h/2p{e} (in electron Volts)	h/{e}	6.582 122 0 (20) ´ 10-16 eV s
Planck Mass = (hc/G)1/2	mP	2.176 71 (14) ´ 10-8 kg
Planck Length = h/mPc = (hG/c3)1/2	l P	1.616 05 (10) ´ 10-35 m
Planck Time = lP/c = (hG/c5)1/2	tP	5.390 56 (34) ´ 10 -44 s

Electromagnetic Constants
Constant	Symbol	Value
Electronic Charge Quantum	e	1.602 177 33 (49) ´ 10-19 C
Quantized Electronic Charge = e/h	e/h	2.417 988 36 (72) ´ 1014 A J -1
Magnetic Flux Quantum = h/2e	Fo	2.037 834 61 (61) ´ 10-15 Wb
Josephson Frequency/Voltage Quotient = 2e/h	2e /h	4.835 976 7 (14) ´ 1015 Hz V-1
Quantized Hall Conductance = e2/h	e2/h	3.874 046 14 (17) ´ 10-5 S
Quantized Hall Resistance = h/e2 = moc/2a	RH	25 812.805 6 (12) W

Bohr Magneton
Constant	Symbol	Value
Bohr Magneton = eh/2me	m B	9.274 015 4 (31) ´ 10-24 J T-1
Bohr Magneton = mB/{e} (in electron Volts)	mB/e	5.788 382 63 (52) ´ 10-5 eV T-1
Bohr Magneton = mB /h (in Hertz)	mB /h	1.399 624 18 (42) ´ 1010 Hz T-1
Bohr Magneton = mB/hc (in wavenumbers)	mB/hc	46.686 437 (14) m-1 T-1
Bohr Magneton = mB/k (in Kelvins)	mB/k	0.671 709 9 (57) K T -1

Nuclear Magneton
Constant	Symbol	Value
Nuclear Magneton = eh /2mp	mN	5.050 786 6 (17) ´ 10-27 J T-1
Nuclear Magneton = mN/{e} (in electron Volts)	mN/e	3.152 451 66 (28) ´ 10-8 eV T-1
Nuclear Magneton = mN/ h (in Hertz)	mN/h	7.622 591 4 (23) MHz T-1
Nuclear Magneton = mN/hc (in wavenumbers)	mN/hc	2.542 622 81 (77) ´ 10-2 m-2 T-1
Nuclear Magneton = mN/k (in Kelvins)	mN/k	3.658 246 (31) ´ 10-4 K T-1

(Inverse) Fine Structure Constant
Constant	Symbol	Value
Fine Structure Constant = moce2/2h	a	7.297 353 08 (33) ´ 10-3
Inverse Fine Structure Constant = 2h/moce 2	1/a = a -1	137.035 989 5 (61)

Rydberg Constant
Constant	Symbol	Value
Rydberg Constant = meca2/2h	R¥	10 973 731.534 (13) m-1
Rydberg Constant = R¥ c (in Hertz)	R¥c	3.289 841 949 9 (40) ´ 1015 Hz
Rydberg Constant = R¥hc (in Joules)	R¥hc	2.179 874 1 (13) ´ 10-18 J
Rydberg Constant = R¥ hc/{e} (in electron Volts)	R ¥hc/{e}	13.605 698 1 (40) eV

Physical Constants
Constant	Symbol	Value
Bohr Radius = a/4pR ¥	ao	0.529 177 249 (24) ´ 10-10 m
Hartree Energy = e2/4peoao = 2R¥hc	Eh	4.359 748 2 (26) ´ 10-18 J
Hartree Energy = Eh/{e} (in electron Volts)	Eh/{e}	27.211 396 1 (81) eV
Quantum of Circulation = h/2me	h/2me	3.636 948 07 (33) ´ 10-4 m2 s-1
Quanta of Circulation = h/m e	h/me	7.273 896 14 (65) ´ 10-4 m2 s-1

Chemical Constants
Constant	Symbol	Value
Avogadro's Number	N A, L	6.022 136 7 (36) ´ 1023 mol-1
Atomic Mass Constant = m(12C)/12 = 1 Dalton (Da)	mu	1.660 540 2 (10) ´ 10-27 kg
Atomic Mass Constant = muc2/{e} (in electron Volts)	mu	931.494 32 (28) MeV
Faraday Constant	F	96 485.309 (29) C mol -1
Molar Planck Constant = NA h	NAh	3.990 313 23 (36) ´ 10-10 J s mol-1
Molar Planck Constant = NAhc	NAhc	0.119 626 58 (11) J m mol-1
Molar Gas Constant	R	8.314 510 (70) J mol-1 K-1
Molar Volume = RT/p (ideal gas at 1 atm/273.15 K)	Vm	22 414.10 (19) cm3 mol-1
Loschmidt Constant = NA/Vm	no	2.686 763 (23) ´ 1025 m-3

Boltzmann Constant
Constant	Symbol	Value
Boltzmann Constant = R/NA	k, kB	1.380 658 (12) ´ 10-23 J K-1
Boltzmann Constant = k/{e} (in electron Volts)	k/{e}	8.617 385 (73) ´ 10-5 eV K-1
Boltzmann Constant = k/h (in Hertz)	k/h	2.083 674 (18) ´ 1010 Hz K-1
Boltzmann Constant = k/hc (in wavenumbers)	k /hc	69.503 87 (59) m-1 K-1

Physicochemical Constants
Constant	Symbol	Value
Stefan-Boltzmann Constant = (p2/60)k4/h3 c2	s	5.670 51 (19) ´ 10-8 m-2 K-4
First Radiation Constant = 2phc2	c1	3.741 774 9 (22) ´ 10-16 W m2
Second Radiation Constant = hc/k	c2	0.014 387 69 (12) m K

Electron Constants
Constant	Symbol	Value
Electron Mass	me	9.109 389 7 (54) ´ 10-31 kg
Electron Mass (in atomic mass units)	m e	5.485 799 03 (13) ´ 10-4 u (amu)
Electron Mass = m ec2/{e} (in electron Volts)	m e	0.510 999 06 (15) MeV
Electron - Proton Mass Ratio = me/mp	me /mp	5.446 170 13 (11) ´ 10-4
Electron Specific Charge = -e/me	-e/me	1.758 819 62 (53) ´ 1011 C kg-1
Electron Molar Mass	M(e)	5.485 799 03 (13) ´ 10-7 kg mol-1
Electron Compton Wavelength = h /mec	l C(e)	2.426 310 58 (22) ´ 10-12 m
Electron Compton Wavelength = lC(e)/2p = aao = a 2/4pR¥	l C(e)	3.861 593 23 (35) ´ 10 -13 m
Electron Classical Radius = a2/ao	re	2.817 940 92 (38) ´ 10-15 m
Thomson Cross Section = (8p /3)re2	s e	0.665 246 16 (18) ´ 10-28 m2
Electron Magnetic Moment	me	928.477 01 (31) ´ 10-26 J T-1
Electron Magnetic Moment = m e/mB (in Bohr magnetons)	me/mB	1.001 159 652 193 (10)
Electron Magnetic Moment = me/mN (in nuclear magnetons)	me/mN	1838.282 000 (37)
Electron Magnetic Moment Anomaly = me/mB - 1	ae	1.159 652 193 (10) ´ 10-3
Electron g- factor = 2(1 + ae)	ge	2.002 319 304 386 (20)
Electron - Proton Magnetic Moment Ratio = me/mp	me/ mp	658.210 688 1 (66)

Proton Constants
Constant	Symbol	Value
Proton Mass	mp	1.672 623 1 (10) ´ 10-27 kg
Proton Mass (in atomic mass units)	m p	1.007 276 470 (12) u (amu)
Proton Mass = mpc2/{e} (in electron Volts)	mp	938.272 31 (28) MeV
Proton - Electron Mass Ratio = mp/me	mp/me	1836.152 701 (37)
Proton Specific Charge = e/m p	e/mp	9.578 830 9 (29) ´ 107 C kg-1
Proton Molar Mass	M(p)	1.007 276 470 (12) ´ 10-3 kg mol-1
Proton Compton Wavelength = h/mp c	lC(p)	1.321 410 02 (12) ´ 10-15 m
Proton Compton Wavelength = lC(p) /2p	l C(p)	2.103 089 37 (19) ´ 10-16 m
Proton Magnetic Moment	mp	1.410 607 61 (47) ´ 10-26 J T-1
Proton Magnetic Moment = mp/mB (in Bohr magnetons)	mp/mB	1.521 032 202 (15) ´ 10-3
Proton Magnetic Moment = mp/mN (in nuclear magnetons)	m p/mN	2.792 847 386 (63)
Proton Gyromagnetic Ratio	gp	26 752.212 8 (81) ´ 104 s-1 T-1
Proton Gyromagnetic Ratio = gp/2p	gp/2p	42.577 469 (13) MHz T-1

Neutron Constants
Constant	Symbol	Value
Neutron Mass	mn	1.674 928 6 (10) ´ 10-27 kg
Neutron Mass (in atomic mass units)	m n	1.008 664 904 (14) u (amu)
Neutron Mass = mnc2/{e} (in electron Volts)	mn	939.565 63 (28) MeV
Neutron - Electron Mass Ratio = mn/me	mn/me	1836.683 662 (40)
Neutron - Proton Mass Ratio = mn /mp	mn/mp	1.001 378 404 (9)
Neutron Molar Mass	M(n)	1.008 664 904 (14) ´ 10 -3 kg mol-1
Neutron Compton Wavelength = h/mnc	l C(n)	1.319 591 10 (12) ´ 10-15 m
Neutron Compton Wavelength = lC(n)/2p	lC(n)	2.100 194 45 (19) ´ 10-16 m
Neutron Magnetic Moment	m n	0.966 237 07 (40) ´ 10-26 J T-1
Neutron Magnetic Moment = mn/m B (in Bohr magnetons)	m n/mB	1.041 875 63 (25) ´ 10-3
Neutron Magnetic Moment = mn/ mN (in nuclear magnetons)	mn/mN	1.913 042 75 (45)
Neutron - Electron Magnetic Moment Ratio = mn/me	m n/mB	1.040 668 82 (25) ´ 10-3
Neutron - Proton Magnetic Moment Ratio = mn /mp	mn/mp	0.684 979 24 (16)

Energy Equivalence I
Units	J (Joule)	kg (kilogram)
1 J (Joule) =	1 J (Joule)	1.112 650 06 ´ 10-17 kg
1 kg (kilogram) =	8.987 551 787 ´ 1016 J	1 kg (kilogram)
1 m-1 (wavenumber) =	1.986 447 5 (12) ´ 10-25 J	2.210 220 9 (13) ´ 10-42 kg
1 Hz (Hertz) =	6.626 075 5 (40) ´ 10-34 J	7.372 503 2 (44) ´ 10 -51 kg
1 K (Kelvin) =	1.380 658 (12) ´ 10-23 J	1.536 189 (13) ´ 10-40 kg
1 eV (electron Volt) =	1.602 177 33 (49) ´ 10-19 J	1.782 662 70 (54) ´ 10-36 kg
1 u (atomic mass unit) =	1.492 419 09 (88) ´ 10-10 J	1.660 540 2 (10) ´ 10-27 kg
1 (atomic energy unit) Hartree =	4.359 748 2 (26) ´ 10-18 J	4.850 874 1 (29) ´ 10 -35 kg

Energy Equivalence II
Units	m-1 (wavenumber)	Hz (Hertz)
1 J (Joule) =	5.034 112 5 (30) ´ 1024 m-1	1.509 188 97 (90) ´ 1033 Hz
1 kg (kilogram) =	4.524 434 7 (27) ´ 1041 m-1	1.356 391 40 (81) ´ 1050 Hz
1 m-1 (wavenumber) =	1 m-1 (wavenumber)	299 792 458 Hz
1 Hz (Hertz) =	3.335 640 952 ´ 10-9 m -1	1 Hz (Hertz)
1 K (Kelvin) =	69.503 87 (59) m-1	2.083 674 (18) ´ 1010 Hz
1 eV (electron Volt) =	806 554.10 (24) m-1	2.417 988 36 (72) ´ 1014 Hz
1 u (atomic mass unit) =	7.513 005 63 (67) ´ 1014 m-1	2.252 342 42 (20) ´ 1023 Hz
1 Hartree (atomic energy unit) =	21 947 463.067 (26) m-1	6.579 683 899 9 (78) ´ 1015 Hz

Energy Equivalence III
Units	K (Kelvin)	eV (electron Volt)
1 J (Joule) =	7.242 924 (61) ´ 10 22 K	6.241 506 4 (19) ´ 1018 eV
1 kg (kilogram) =	6.509 616 (55) ´ 1039 K	5.609 586 2 (17) ´ 1035 eV
1 m-1 (wavenumber) =	0.014 387 69 (12) K	1.239 842 44 (37) ´ 10-6 eV
1 Hz (Hertz) =	4.799 216 (41) ´ 10-11 K	4.135 669 2 (12) ´ 10-15 eV
1 K (Kelvin) =	1 K (Kelvin)	8.617 385 (73) ´ 10-5 eV
1 eV (electron Volt) =	11 604.45 K	1 eV (electron Volt)
1 u (atomic mass unit) =	1.080 947 8 (91) ´ 1013 K	931.494 32 (28) ´ 106 eV
1 Hartree (atomic energy unit) =	3.157 733 (27) ´ 105 K	27.211 396 1 (81) eV

Energy Equivalence IV
Units	u (atomic mass unit)	Hartree (atomic energy unit)
1 J (Joule) =	6.700 530 8 (40) ´ 109 u	2.293 710 4 (14) ´ 1017 Hartree
1 kg (kilogram) =	6.022 136 7 (36) ´ 1026 u	2.061 484 1 (12) ´ 1034 Hartree
1 m-1 (wavenumber) =	1.331 025 22 (12) ´ 10-15 u	4.556 335 267 2 (54) ´ 10-8 Hartree
1 Hz (Hertz) =	4.439 822 24 (40) ´ 10-24 u	1.519 829 850 8 (18) ´ 10-16 Hartree
1 K (Kelvin) =	9.251 140 (78) ´ 10-14 u	3.166 829 (27) ´ 10-6 Hartree
1 eV (electron Volt) =	1.073 543 85 (33) ´ 10-9 u	0.036 749 309 (11) Hartree
1 u (atomic mass unit) =	1 u (atomic mass unit)	3.423 177 25 (31) ´ 107 Hartree
1 Hartree (atomic energy unit) =	2.921 262 69 (26) ´ 10-8 u	1 Hartree (atomic energy unit)

Energy Conversion Factors I
Units	J (Joule)	kg (kilogram)
1 J (Joule) ´ factor = energy equivalent =	1 J (Joule) ´ 1 = 1 J (Joule)	1 J (Joule) ´ 1/{c2} = 1.112 650 06 ´ 10-17 kg
1 kg (kilogram) ´ factor = energy equivalent =	1 kg (kilogram) ´ {c2} = 8.987 551 787 ´ 1016 J	1 kg (kilogram) ´ 1 = 1 kg (kilogram)
1 m-1 (wavenumber) ´ factor = energy equivalent =	1 m-1 (wavenumber) ´ {hc} = 1.986 447 5 (12) ´ 10-25 J	1 m-1 (wavenumber) ´ { h/c} = 2.210 220 9 (13) ´ 10-42 kg
1 Hz (Hertz) ´ factor = energy equivalent =	1 Hz (Hertz) ´ {h} = 6.626 075 5 (40) ´ 10-34 J	1 Hz (Hertz) ´ {h/c2} = 7.372 503 2 (44) ´ 10-51 kg
1 K (Kelvin) ´ factor = energy equivalent =	1 K (Kelvin) ´ {k } = 1.380 658 (12) ´ 10-23 J	1 K (Kelvin) ´ {k/c 2} = 1.536 189 (13) ´ 10 -40 kg
1 eV (electron Volt) ´ factor = energy equivalent =	1 eV (electron Volt) ´ {e} = 1.602 177 33 (49) ´ 10-19 J	1 eV (electron Volt) ´ {e/c2 } = 1.782 662 70 (54) ´ 10-36 kg
1 u (atomic mass unit) ´ factor = energy equivalent =	1 u (atomic mass unit) ´ {mu/c2} = 1.492 419 09 (88) ´ 10-10 J	1 u (atomic mass unit) ´ { mu} = 1.660 540 2 (10) ´ 10-27 kg
1 Hartree (atomic energy unit) ´ factor = energy equivalent =	1 Hartree ´ {2R¥hc} = 4.359 748 2 (26) ´ 10-18 J	1 Hartree ´ {2R¥ h/c} = 4.850 874 1 (29) ´ 10-35 kg

Energy Conversion Factors II
Units	m-1 (wavenumber)	Hz (Hertz)
1 J (Joule) ´ factor = energy equivalent =	1 J (Joule) ´ 1/{hc} = 5.034 112 5 (30) ´ 1024 m-1	1 J (Joule) ´ 1/{h} = 1.509 188 97 (90) ´ 1033 Hz
1 kg (kilogram) ´ factor = energy equivalent =	1 kg (kilogram) ´ {c/h} = 4.524 434 7 (27) ´ 1041 m-1	1 kg (kilogram) ´ {c2/h} = 1.356 391 40 (81) ´ 1050 Hz
1 m-1 (wavenumber) ´ factor = energy equivalent =	1 m-1 (wavenumber) ´ 1 = 1 m-1 (wavenumber)	1 m-1 (wavenumber) ´ {c} = 299 792 458 Hz
1 Hz (Hertz) ´ factor = energy equivalent =	1 Hz (Hertz) ´ 1/{c} = 3.335 640 952 ´ 10-9 m-1	1 Hz (Hertz) ´ 1 = 1 Hz (Hertz)
1 K (Kelvin) ´ factor = energy equivalent =	1 K (Kelvin) ´ {k /hc} = 69.503 87 (59) m-1	1 K (Kelvin) ´ {k/h} = 2.083 674 (18) ´ 1010 Hz
1 eV (electron Volt) ´ factor = energy equivalent =	1 eV (electron Volt) ´ {e/hc} = 806 554.10 (24) m-1	1 eV (electron Volt) ´ {e/h} = 2.417 988 36 (72) ´ 1014 Hz
1 u (atomic mass unit) ´ factor = energy equivalent =	1 u (atomic mass unit) ´ {muc/h} = 7.513 005 63 (67) ´ 1014 m-1	1 u (atomic mass unit) ´ {muc2/h} = 2.252 342 42 (20) ´ 1023 Hz
1 Hartree (atomic energy unit) ´ factor = energy equivalent =	1 Hartree ´ {2R¥} = 21 947 463.067 (26) m-1	1 Hartree ´ {2R¥c} = 6.579 683 899 9 (78) ´ 1015 Hz

Energy Conversion Factors III
Units	K (Kelvin)	eV (electron Volt)
1 J (Joule) ´ factor = energy equivalent =	1 J (Joule) ´ {1/k} = 7.242 924 (61) ´ 1022 K	1 J (Joule) ´ {1/e} = 6.241 506 4 (19) ´ 1018 eV
1 kg (kilogram) ´ factor = energy equivalent =	1 kg (kilogram) ´ {c2/k} = 6.509 616 (55) ´ 1039 K	1 kg (kilogram) ´ {c2/e} = 5.609 586 2 (17) ´ 1035 eV
1 m-1 (wavenumber) ´ factor = energy equivalent =	1 m-1 (wavenumber) ´ {hc/k} = 0.014 387 69 (12) K	1 m-1 (wavenumber) ´ {hc/e} = 1.239 842 44 (37) ´ 10-6 eV
1 Hz (Hertz) ´ factor = energy equivalent =	1 Hz (Hertz) ´ {h/k} = 4.799 216 (41) ´ 10-11 K	1 Hz (Hertz) ´ {h/e} = 4.135 669 2 (12) ´ 10-15 eV
1 K (Kelvin) ´ factor = energy equivalent =	1 K (Kelvin) ´ 1 = 1 K (Kelvin)	1 K (Kelvin) ´ { k/e} = 8.617 385 (73) ´ 10 -5 eV
1 eV (electron Volt) ´ factor = energy equivalent =	1 eV (electron Volt) ´ {e/k} = 11 604.45 K	1 eV (electron Volt) ´ 1 = 1 eV (electron Volt)
1 u (atomic mass unit) ´ factor = energy equivalent =	1 u (atomic mass unit) ´ {mu c2/k} = 1.080 947 8 (91) ´ 1013 K	1 u (atomic mass unit) ´ {muc2 /e} = 931.494 32 (28) ´ 10 6 eV
1 Hartree (atomic energy unit) ´ factor = energy equivalent =	1 Hartree ´ {2R¥ hc/k} = 3.157 733 (27) ´ 105 K	1 Hartree ´ {2R¥hc/e} = 27.211 396 1 (81) eV

Energy Conversion Factors IV
Units	u (atomic mass unit)	Hartree (atomic energy unit)
1 J (Joule) ´ factor = energy equivalent =	1 J (Joule) ´ {1/muc2} = 6.700 530 8 (40) ´ 109 u	1 J (Joule) ´ {1/2R¥hc} = 2.293 710 4 (14) ´ 1017 Hartree
1 kg (kilogram) ´ factor = energy equivalent =	1 kg (kilogram) ´ {1/m u} = 6.022 136 7 (36) ´ 10 26 u	1 kg (kilogram) ´ {c/2R¥h} = 2.061 484 1 (12) ´ 1034 Hartree
1 m-1 (wavenumber) ´ factor = energy equivalent =	1 m -1 (wavenumber) ´ {h/m uc} = 1.331 025 22 (12) ´ 10-15 u	1 m-1 (wavenumber) ´ {1/2R¥ } = 4.556 335 267 2 (54) ´ 10-8 Hartree
1 Hz (Hertz) ´ factor = energy equivalent =	1 Hz (Hertz) ´ {h/mu c2} = 4.439 822 24 (40) ´ 10-24 u	1 Hz (Hertz) ´ 1/2R¥c} = 1.519 829 850 8 (18) ´ 10-16 Hartree
1 K (Kelvin) ´ factor = energy equivalent =	1 K (Kelvin) ´ {k/muc2} = 9.251 140 (78) ´ 10-14 u	1 K (Kelvin) ´ {k/2R¥hc} = 3.166 829 (27) ´ 10-6 Hartree
1 eV (electron Volt) ´ factor = energy equivalent =	1 eV (electron Volt) ´ {e/ muc2} = 1.073 543 85 (33) ´ 10-9 u	1 eV (electron Volt) ´ {e/2R¥hc} = 0.036 749 309 (11) Hartree
1 u (atomic mass unit) ´ factor = energy equivalent =	1 u (atomic mass unit) ´ 1 = 1 u (atomic mass unit)	1 u (atomic mass unit) ´ {muc /2R¥h} = 3.423 177 25 (31) ´ 107 Hartree
1 Hartree (atomic energy unit) ´ factor = energy equivalent =	1 Hartree ´ {2R¥h/muc} = 2.921 262 69 (26) ´ 10-8 u	1 Hartree (atomic energy unit) ´ 1 = 1 Hartree (atomic energy unit)

Atomic Units

Quantity	Name	Symbol	Value
mass	electron rest mass	me	» 9.109 5 ´ 10-31 kg
charge	electron charge	e	» 1.602 2 ´ 10-19 C
action	Planck constant/2p	h = h/2p	» 1.054 6 ´ 10-34 J s
length	Bohr	ao = 4 peoh2/m ee2	» 5.291 8 ´ 10-11 m
energy	Hartree	Eh = h2/meao2	» 4.359 8 ´ 10-18 m
time	au of time	h/Eh	» 2.418 9 ´ 10 -17 s
velocity	au of velocity	aoEh/h	» 2.187 7 ´ 10 6 m s-1
force	au of force	Eh/ao	» 8.238 9 ´ 10-8 N
momemtum (linear)	au of momemtum	h/ao	» 1.992 9 ´ 10-24 N s
electric current	au of current	eE h/h	» 6.623 6 ´ 10-3 A
electric field	au of electric field	Eh /eao	» 5.142 2 ´ 1011 V m-1
electric dipole moment	au of electric dipole	eao	» 8.478 4 ´ 10-30 C m
magnetic flux density	au of magnetic flux density	h/eao2	» 2.230 5 ´ 105 T
magnetic dipole moment	au of magentic dipole	Eh/me = 2mB	» 1.854 8 ´ 10-23 J T-1
speed of light (vacuum)	c/au of velocity	ch/aoEh = a-1	» 137.04

Note : In theoretical calculations units are usually renormalized to h = k_B = c = 1.