SI and non-SI Permiteed Units
Physical quantity
Units
Relation with SI units
Name
Symbol
Length
millimetre
сcentimetre
decimetre
cm
dm
1mm = 10
1cm = 10
1dm = 10
mm
-3
-2
-1
m
m
m
Astronomical distances
lightyear
1 lightyear = 9460.55Tm
15
= 9.46055×10
m
Wave lengths atomic distances
angstrom
Å
1Å = 10
-10
m
4
m
Area
are
decare
hectare
a
da
ha
1a = 10²m
1da = 10³m
1ha = 10
Effective section
(nuclear physics)
barn
b
1/3
SI and non-SI Permiteed Units
1b = 10
-28
Volume (timber)
st
1st = 1m³
stero
Mass
ton
Quintal
Hectogramme
Gramme
Atomic mass unit
t
q
hg
g
u
1t = 10³kg = 1Mg
1q = 10²kg
1hg = 10
1g = 10
1u = 1.6605655×10
-1
-3
-27
m²
kg
kg
kg
Mass of precious stones
metric carat
carat
-4
1carat = 2×10
kg
Mass per unit length
of fibres and yarns
tex
tex
1tex = 10
kg×m
Pressure and tension
normal atmosphere
bar
atm
1bar = 10²kN/m² = 10
1atm = 101325 Pa
-6
-1
bar
5
Pa
Arterial tension
(blood pressure)
millimetres of mercury
mm Hg
1mm Hg = 133.322 Pa
2/3
SI and non-SI Permiteed Units
Force
dyne
dyn
1dyn = 10
Energy
erg
electronvolt
erg
eV
1erg = 10
1eV = 1.6021×10
Kinematic viscosity
stoke
St
1St = 10
-5
N
-7
J
J
-19
-4
Dynamic viscosity
poise
p
-1
1p = 10
Acceleration of gravity gal
Gal
-2
1Gal = 10
m²×s
-1
Pa×s
m×s
-2
3/3