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Physical Quantities

Physical quantities are quantities that can be measured.

We often measure quantities like length, mass, time,

temperature andelectric current.

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S.I Units

Physical quantities are measured in S.I

units.

he symbols of S.I is an abbre!iation for

International System of Units.

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Quantity Unit Symbol of unit

"ength metre m

#ass kilogram kg

ime second s

emperature kel!in $

%lectric current ampere &

able'.( ) Some physical quantities and their S.I units.

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Using prefixes in measurements

We usually use prefi*es +hen the

quantities +e measure ha!e !ery big

!aluesor !ery small !alues.

ommon prefi*es used in e!eryday life

include milli-, centi- and kilo-.

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Prefix Symbol Value of prefix

kilo k '

centi c ' / '

milli m ' / '

deci d ' / '

mega # ',,

able '.0 ) Symbols and some !alues of prefi*es.

1ack

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' cm 2 ' mm

' m 2 ' cm' km 2 'm

1ack

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'.What is a physical quantity3

Physical quantity is quantity that can be measured.

(. #atch the follo+ing physical quantities to their S.I.

units correctly.

4a5 #ass ampere 4&5

4b5 "ength seconds 4s5

4c5 %lectric current kilogram 4kg5

4d5 ime kel!in 4$5

4e5 emperature metre 4m5

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0. 6i!e the !alues of these prefi*es)

4a5 milli-

4b5 centi-

4c5 kilo-

' / '

' / '

'

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7. 8e+rite the !alues of these measurements using

prefi*es )

4a5 9, g 2 ::::::::kg

4b5 .; g 2 ::::::::mg

4c5