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Guidelines for Examination

 
 

1.3 Prefixes and their symbols used to designate certain decimal multiples and submultiples

Factor

Prefix

Symbol

Factor

Prefix

Symbol

1024

yotta

Y

10-1

deci

d

1021

zetta

Z

10-2

centi

c

1018

exa

E

10-3

milli

m

1015

peta

P

10-6

micro

μ

1012

tera

T

10-9

nano

n

109

giga

G

10-12

pico

p

106

mega

M

10-15

femto

f

103

kilo

k

10-18

atto

a

102

hecto

h

10-21

zepto

z

101

deca

da

10-24

yocto

y

 

The names and symbols of the decimal multiples and submultiples of the unit of mass are formed by attaching prefixes to the word 'gram' and their symbols to the symbol 'g'.

Where a derived unit is expressed as a fraction, its decimal multiples and submultiples may be designated by attaching a prefix to units in the numerator or the denominator, or in both these parts.

Compound prefixes, that is to say prefixes formed by the juxtaposition of several of the above prefixes, may not be used.