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The coefficient of volumetric expansion of mercury is 18×10-5/°C. The thermometer bulb has a volume of 10-6 m3 and cross-section of the stem is 0.002cm2. Assuming that bulb is filled with mercury at 0°C, the increase in length of the mercury column at 100°C will be ___________

The coefficient of volumetric expansion of mercury is 18×10-5/°C. The thermometer bulb has a volume of 10-6 m3 and cross-section of the stem is 0.002cm2. Assuming that bulb is filled with mercury at 0°C, the increase in length of the mercury column at 100°C will be ___________ Correct Answer 9cm

Let h be the length of mercury column at 100°C. Then Expansion in mercury = Volume of stem γV∆T=Ah h=γV∆T/A=(18×10-5×10-6×100)/(0.002×10-4) m h=9×10-2 m h=9cm.

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