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The coefficient of apparent expansion of mercury in a glass vessel is \( 153 \times 10^{-6} /{ }^{\circ} \mathrm{C} \) and that in a steel vessel is \( 144 \times 10^{-6} /{ }^{\circ} \mathrm{C} \). If \( \alpha \) for steel is \( 12 \times 10^{-6} /{ }^{\circ} \mathrm{C} \), then that of glass is
(1) \( 9 \times 10^{-6} /{ }^{\circ} \mathrm{C} \)
(2) \( 6 \times 10^{-6}{ }^{\circ} \mathrm{C} \)
(3) \( 36 \times 10^{-6} /^{\circ} \mathrm{C} \)
(4) \( 27 \times 10^{-6} /{ }^{\circ} \mathrm{C} \)
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