Explain the meaning of the statement relative density of aluminium is 2.7 .

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Solution

The relative density of a substance express the heaviness (or density) of the substance in comparison to water. The relative density of Aluminum is 2.7. Now, by saying that the relative density of Aluminum is 2.7 we mean that Alum6is 2.7 times heavy as an equal volume of water.

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Explain the meaning of the statement 'Relative density of aluminium is 2.7'.

Q. The relative density of aluminium is 2.7. What is thedensity of aluminiumin SI units?(Density of water = 1.0x

10^{3} k g / m^{3}

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Q. Aluminium has a density of

2.7 g / c c

. The mass of

15 c c

of aluminium is

Q. Two wires of equal length, one of aluminium and the other of copperhave the same resistance. Which of the two wires is lighter? Hence explain why aluminium wires are preferred for overhead power cables.(rAl = 2.63 × 10–8 W m, rCu = 1.72 × 10–8 W m, Relative density ofAl = 2.7, of Cu = 8.9.)

Two wires of equal length, one of aluminium and the other of copper have the same resistance. Which of the two wires is lighter? Hence explain why aluminium wires are preferred for overhead power cables. (ρ_Al = 2.63 × 10⁻⁸ Ω m, ρ_Cu = 1.72 × 10⁻⁸ Ω m, Relative density of Al = 2.7, of Cu = 8.9.)

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