Question

solve:-
The density of air is 1.28g litre. Express in:-
(a) g cm-3
(b)kg m-3

Answer 1

) 1000 litre = 1

m

3


  Density of air = 1.28g/ 1000

m

3

 =

1.28×

10

−3

gc

m

−3



(b) 1.28g =

1.28×

10

−3

kg


 

1

m

3

=1000litres

1litre=

1

1000

m

−3

1.28g/litre=

1.28×

10

−3

kg

1

1000

1 ltr = 1000ml = 1000cm-3, so the first answer is simple 1.28/1000 g cm-3 i.e. 1.28x10-3 g cm-3

for the second part, 1 kg = 1000g and 1m-3 = 1000 ltr, thus both numerator and denominator increased by 1000 times cancel each other and the numerical value remains the same i.e. 1.28kgm3
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