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Mercury thermometer bulb and stem: length of mercury column at 100 C

The same question, asked 2 times: 23 Apr 2025 S1*, 14 May 2026 S1. Every wording below, oldest first.

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  1. Question 1

    23 Apr 2025 S1

    50
    A thermometer bulb has volume 10−6 m310^{-6}\,\text{m}^3 and cross-section of the stem is 0.002 cm20.002\,\text{cm}^2. The bulb is filled with mercury at 0∘C0^\circ C. If the thermometer reads temperature as 100∘C100^\circ C, then the length of mercury column is (coefficient of cubical expansion of mercury =18×10−5/∘C=18\times10^{-5}/{}^\circ C)

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  2. Question 2

    14 May 2026 S1

    112
    The coefficient of volume expansion of mercury is 18×10−5/∘C18 \times 10^{-5}/^\circ\mathrm{C}. A thermometer bulb has volume 10−6 m310^{-6}\ \mathrm{m^3} and cross-section of stem is 0.004 cm20.004\ \mathrm{cm^2}. Assuming bulb is filled with mercury at 0∘C0^\circ\mathrm{C} then the mercury column at 100∘C100^\circ\mathrm{C} is

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