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The density of a substance decreases from
\( \mathrm{P} \) \( 10 \times 10^{3} \mathrm{~kg} \mathrm{~m}^{-3} \) to \( 7 \times 10^{3} \mathrm{~kg} \mathrm{~m}^{-3} \) on heating it from
\( \mathrm{W} \) \( 0^{\circ} \mathrm{C} \) to \( 100^{\circ} \mathrm{C} \). The coefficient of linear expansion of the substance is
(1) \( 3 \times 10^{-3}{ }^{\circ} C^{-1} \)
(2) \( 10^{-3} \mathrm{C}^{-1} \)
(3) \( 2 \times 10^{-3}{ }^{-1} \)
(4) \( 10^{-4}{ }^{\circ} \mathrm{C}^{-1} \)
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