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At a temperature of \( 20^{\circ} \mathrm{C} \), the volume of a certain glass flask, up to a reference mark on the cylindrical stem of the flask is exactly \( 100 \mathrm{~cm}^{3} \). The flask is filled to this point with a liquid of coefficient of cubical expansion \( 120 \times 10^{-5}{ }^{\circ} \mathrm{C}^{-1} \), when both the flask and the liquid are at \( 20^{\circ} \mathrm{C} \). The cross-section of the
W stem is \( 1 \mathrm{~mm}^{2} \) and the coefficient of linear expansion of glass is \( 8 \times 10^{-6}{ }^{\circ} \mathrm{C}^{-1} \). Find the rise or fall of the liquid level in the stem, when the temperature is raised to \( 40^{\circ} \mathrm{C} \).
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