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Guidelines for Examination in the EPO
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1.2.3
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Derived SI units having names and symbols |
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Quantity |
Unit |
|
Expression |
|
|
|
Name |
Symbol |
In other SI units |
In terms of base or supplementary SI units |
|
Frequency |
hertz |
Hz |
|
s-1 |
|
Force |
newton |
N |
|
m.kg.s-2 |
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Pressure, stress |
pascal |
Pa |
N.m-2 |
m-1.kg.s-2 |
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Energy, work; quantity of heat |
joule |
J |
N.m |
m2.kg.s-2 |
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Power(1), radiant flux |
watt |
W |
J.s-1 |
m2.kg.s-3 |
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Quantity of electricity, electric charge |
coulomb |
C |
|
s.A |
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Electric potential, potential difference, electromotive force |
volt |
V |
W.A-1 |
m2.kg.s-3.A-1 |
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Electric resistance |
ohm |
O |
V.A-1 |
m2.kg.s-3.A-2 |
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Conductance |
siemens |
S |
|
m-2.kg-1.s3.A2 |
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Capacitance |
farad |
F |
A.V-1 |
m-2.kg-1.s4.A2 |
|
Magnetic flux |
weber |
Wb |
C.V-1 |
m2.kg.s-2.A-1 |
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Magnetic flux density |
tesla |
T |
|
kg.s-2.A-1 |
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Inductance |
henry |
H |
V.s |
m2.kg.s-2.A-2 |
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Luminous flux |
lumen |
lm |
Wb.m-2 |
cd.sr |
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Illuminance |
lux |
lx |
Wb.A-1 |
m-2.cd.sr |
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Activity (of a radionuclide) |
becquerel |
Bq |
lm.m-2 |
s-1 |
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Absorbed dose, specific energy imparted, kerma, absorbed dose index |
gray |
Gy |
J.kg-1 |
m2.s-2 |
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Dose equivalent |
sievert |
Sv |
J.kg-1 |
m2.s-2 |
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(1)
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Special names for the unit of power: the name volt-ampere (symbol 'VA') is used to express the apparent power of alternating electric current, and var (symbol 'var') is used to express reactive electric power. |
Units derived from SI base units or supplementary units may be expressed in terms of the units listed in this annex.
In particular, derived SI units may be expressed by the special names and symbols given in the above table. For example, the SI unit of dynamic viscosity may be expressed as m-1.kg.s-1 or N.s.m-2 or Pa.s.
