Relation to SI Unit

NAME	SYMBOL	RELATION TO SI
length, l
metre (SI unit)	m
centimetre (cgs unit)	cm	= 10-2m
angstrom	Å	=10-10m
Micron	µ	=µm = 10-6m
Mill micron	mµ	=nm = 10-9m
x unit	X	≈1.002X 10-13m
Fermi	f, fm	=fm = 10-15m
Inch	In	= 2.54 x 10-2m
Foot	Ft	=12in = 0.3048m
Yard	Yd	=3ft = 0.9144m
Mile	Mi	=1760yd = 1609.344m
Nautical mile		=1852m
Astronomical unit	AU	=1.49600 x 1011m
Parsec	pc	≈3.08568 x 1016m
Light year	l.y.	≈9.460528 x 1015m
Light second		= 299792458m
area, (A)
Square meter	m^2
Barn	b	=10-28m2
acre	a	≈4046.856m2
hectare	ha	=104 m2
volume(V)
cubic metre	m3
litre	l, L	=dm3 = 10-3 m3
lambda	λ	= µl = 10-6dm3
barrel(US)		≈158.987dm3
gallon(US)	gal(US)	= 3.78541dm3
gallon(UK)	Gal(UK)	=4.54609 dm3
Mass, (m)
Kilogram	Kg
Gram (cgs unit)	g	=10-3kg
electron mass (au)	me	≈9.10939 x 10-31kg
unified atomic mass unit, Daltons	u, Da	=ma(12C)/12 ≈1.660540x10-27kg
gamma	γ	=µg
tonne	t	=Mg =103kg
pound (avoirdupois)	lb	=0.45359237kg
ounce (avoirdupois)	oz	≈28.3495g
ounce(troy)	oz(trou)	≈31.1035g
grain	gr	=64.79891mg
time, (t)
second (SI, cgs unit)	s
au of time	h/Eh	≈2.41888x10-17s
minute	min	=60s
hour	h	=3600s
day	d	=86400s
year	a	≈31556952s
Svedberg	Sv	=10-13s
acceleration, (a)
SI unit	ms-2
standard acceleration of free fall	gn	=9.80665ms-2
gal, Galileo	Gal	=10-2ms-2
force, (F)
Newton (SI unit)	N	=kg m s-2
dyne (cgs unit)	dyn	=g cm s-2 = 10-5N
au of force	Eh/a0	≈8.23873 x 10-8N
kilogram - force	kgf	=9.80665 N
energy, (U)
joule (SI unit)	J	=kg m2 s-2
erg (cgs unit)	erg	= g cm2 s-2 = 10-7J
rydberg	Ry	=Eh/2 ≈ 2.17987 x 10-18 J
electron volt	eV	=e x V ≈ 1.60218 x 10-19J
calorie, thermo chemical	calth	= 4.184J
calorie, international	calIT	=4.1868 J
15ºC calorie	cal15	≈ 4.1855 J
litre atmosphere	1atm	= 101.325 J
British thermal unit	Btu	=1055.06 J
pressure, (p)
Pascal (SI unit)	Pa	= Nm-2 = kg m-1 s-2
atmosphere	atm	= 101325 Pa
bar	bar	=105 Pa
torr	Torr	=(101325/760) Pa ≈ 133.322Pa
millimetre of mercury (conventional)	mmHg	=13.5951 x 980.665 x 10-2 Pa ≈ 133.322 Pa
pounds per square inch	psi	≈ 6.894757 x 103 Pa
power(P)
watt (SI unit)	W	= kg m2 s-3
horse power	hp	= 745.7 W
action, L, J (angular momentum)
SI unit	J S	= kg m2 s-1
cgs unit	erg s	= 10-7 J s
au of action	h = h / 2π	≈1.05457 x 10-34 J s
dynamic viscosity, (η)
SI unit	Pa s	= kg m-1 s-1
poise	P	= 10-1 Pa s
centipoises	cP	= mPa s
kinematic viscosity, (v)
SI unit	m2 s-1
stokes	St	= 10-4 m2 s-1
thermodynamic temperature, (T )
Kelvin (SI unit)	K
degree Rankin	ºR	= (5/9) K
entropy, (S)   heat capacity, (C)
SI unit	J K-1
clausius	Cl	=calth/K = 4.184 J K-1
molar entropy,  (Sm) molar heat capacity, (Cm)
SI unit	J K-1 mol-1
entropy unit	e.u	=calth K-1 mol-1 = 4.184 J K-1 mol-1
molar volume (Vm)
SI unit	m3 mol-1
amagat	amagat	=Vm of real gas at 1 atm and 273.15 K ≈22.4 x 10-3  m3 mol-1
plane angle, (α)
radian (SI unit)	rad
degree	º	= rad x 2π/360 ≈(1/57.29578)rad
minute	'	= degree/60
second	"	= degree/3600
grade	grad	=rad x 2π/400 ≈(1/63.66198)rad
radioactivity, (A)
Becquerel (SI unit)	Bq	=s-1
curie	Ci	=3.7 x 1010 Bq
absorbed dose of radiation
gray (SI unit)	Gy	= J kg-1
rad	rad	=0.01 Gy
dose equivalent
sievert (SI unit)	Sv	= J kg-1
rem	rem	≈0.01 Sv
electric current (I)
ampere (SI unit)	A
esu, Gau	(10/ ζ)A	≈3.33564 x 10-10A
biot (emu)	Bi	=10 A
electric charge (Q)
coulomb (SI unit)	C	= A s
franklin (esu, Gau)	Fr	= (10/ ζ)C ≈3.33564 x 10-10C
emu (abcoulomb)		= 10C
proton charge (au)	e	≈1.60218 x 10-19 C  ≈4.80321 x 10-10Fr
charge density, (ρ)
SI unit	C m-3
esu, Gau	Fr cm-3	= 107 ζ1 C m-3 ≈3.33564 x 10-4 C m-3
electrical potenial,(V), (φ )
volt (SI unit)	V	= J C-1 = J A-1 s-1
esu, Gau	erg Fr-1	Fr cm-1/4πε0 =299.792458 V
mean international volt		=1.00034V
US international volt		= 1.000330 V