Physics - Heat & Thermo Question with Solution | TestHub

A mercury thermometer has a bore of diameter 0.200 mm and a bulb of volume $0.400{\mathrm{cm}}^3$. Take ${\beta }_{Hg}=1.8\times 10^{-4}$ per °C and ${\alpha }_{\text{glass }}=3\times 10^{-6}$ per °C. Find how far the thread moves when the temperature rises by 20°C, in cm.