question_answer

The coefficient of real expansion of mercury is \[18\times {{10}^{-5}}/{}^\circ C.\] The thermometer bulb has a volume of \[{{10}^{-6}}{{m}^{3}}\] and the cross-section of the stem is \[0.002\text{ }c{{m}^{2}}.\] Assuming that the bulb is filled with mercury at \[0{}^\circ C\] the length of the mercury column at \[100{}^\circ C\] will be:

A)  9 cm                                     

B)  18 cm

C)  9 mm                                   

D)  18 mm