1976-HKRS28-16-24_Part03 — Page 31

PART II

The SI supplementary units (See Note (9)

Quantity

Name

Symbol

Plane angle radian

rad

solid aogle

steradian

ar

Definition

the plane angle between two radû of a circle which cut off on the air- cumference an are equal in length to the radius.

the solid angle which, having its vertex in the centre of a sphere, cuts off an area of the surface of the sphere equal to that of a square with sides of length equal to the radius of the sphere.

PART IV

The SI Prefixes (See Note (50)

Factor by which the unit da"multiplied

Name

Symbol

1016

exa

1015

pota

Р

1012

tera

109

giga

106

mega

Quantity

Name

PART III

SI derived units having special names and symbols (See Notes 01 & (4)

Expression in terms of other ST white

102

2 2 2

kilo

EP TO 3 ×

G

M

k

hecto

A

deca

da

Symbol

10-1

deci

10-2

centi

+

frequency

hertz

H2

1

10-3

Gilli

force

newton

N

m kg/st

pressure stress

pascal

Fa

N/m2

10-6

micro

14

energy, work, quantity of heat

joule

J

Nm

10-9

дапо

D

power, radiant dux

walt

ww

J/6

10-12

pico

p

quanlity of electricity,

coulomb

C

0

A:

electric charge

10-13

ferata

f

electric potentia),

volt

V

W/A

10-18

atto

A

potential difference,

électromotive force

capacitance

farad

F

electric resistance

chm

conductance

gicmens

S

magnetic dux

weber

magnetic flux density

tesla

T

Inductance

henry

H

Juminous Bux

lumen

illuminance

lux

radioactivity

becquerel

amount of absorbed

HAY

POŠLE § A S Ò

C/V

VIA

A/V

Wb

Vs

Im

radiation

Eq

1/s

Gy

J/kg

Wb/m2

WD/A

cd st

ed st/m2

Notes

03 An 31 base unde in a undi recantrocaded by the General Conference of Weights and Mcatures a 1 (gadomeniul anlt of $1. By convention the seven $1 base unta pre mended as dimensionally independent.

(2) An 30 nupplementary prit is alt for the slow being our classifed by the General Conference of Walchu kod Measures za Siber an SI bane or na si dorived van.

09 An SI derived moda is a knit which can be expressed alsbrdeally in perma of the

31 bbc mode and/or the Si aupplementary unit.

(4) The decfred under in Pari IIT have been adven special numes and arrabok which may

thesuelve be used to express aber derived u

(5) The ST preters are used to form games and Frmbol of decimer moltiplex and

kab-mula of the $1 unita.