Fig. 4.1 illustrates a mercury-in-glass thermometer constructed with a glass capillary tube.
(a)[3]
Describe how to check whether the $100\,^{\circ}\text{C}$ mark is positioned correctly on the thermometer.
(b)[2]
State and explain how the maximum possible range of the ethanol-in-glass thermometer is different from the range of the thermometer in Fig. 4.1.
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