Chemistry

Multiple and Submultiple - Other Units


Sometimes larger or smaller units than SI are required.

If the length magnitude, where the unit in SI is the meter, has to be expressed in larger units, we use its multiples (kilometer, hectometer, decimeter, etc.) and to use smaller units, we use the submultiples (centimeter, decimeter, mm, etc.).

Observe the formation of multiples and submultiples of units of measurement by using the prefixes SI.

Multiples

PREFIX

SYMBOL

MEANING

yotta

Y

1024

zetta

Z

1021

exhaust

AND

1018

peta

P

1015

will have

T

1012

jig

G

109

mega

M

106

kilo

k

103

hecto

H

10²

deca

gives

10

Submultiples

PREFIX

SYMBOL

MEANING

deci

d

10-1

centi

ç

10-2

mili

m

10-3

micro

µ

10-6

nano

no

10-9

peak

P

10-12

femto

f

10-15

atto

The

10-18

zepto

z

10-21

yocto

y

10-24

See also the simplified table:

km

hm

dam

m

dm

cm

mm

10³

10²

10

1

10-1

10-2

10-3

So:

1km = 1.10³
1µm = 1.10-6
1cm = 1.10-2
1nm = 1.10-9
1mm = 1.10-3

If the quantity is mass:

1kg = 10³g
1g = 10-3 kg
1g = 10³ mg
1mg = 10-3g
1g = 106µg
1 µg = 10-6

For the volume quantity, the unit of l (liter) and mL (milliliter) is much used, where:

1l = 1dm³
1mL = 1cm³

Some countries do not use metric units. They are the units of the English system (mile, yard, inch, foot, pound and ounce).

1 mile = 1609m
1 inch = 25.40mm = 2.540cm
1 yard = 0.914m
1 ounce = 28.35g
1 foot = 0.3048m
1 pound = 453.6g