Fill in the blanks :-

The relative density of lead is 11.3. Its density is ....g cm^{–3}or . ...kg m^{–3}.

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#### Solution 1

Relative density of a substance is given by the relation,

`Relative density = "Density of substance"/"Density of water"`

Density of water = 1 g/cm^{3}

Density of lead = Relative density of lead x Density of water

=11.3 x 1 = 11.3 g/`cm^3`

Again 1g = `1/1000` kg

`1 cm^3 = 10^(-6)m^3`

`1 "g/cm"^3 = 10^(-3)/10^(-6) kg/m^3 = 10^3 "kg/m"^3`

`:. 11.3 "g/cm"^3 = 11.3 xx 10^3 "kg/m"^3`

#### Solution 2

Density= 11.3 g cm^{-3}

=11.3 x 10^{3} kg m^{-3} [1 kg =10^{3} g,1m=10^{2} cm]

=11.3 x 10^{3} kg m^{-4}

Concept: Significant Figures

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