A student calibrates an unmarked liquid-in-glass thermometer. He places the thermometer bulb in ice at 0°C and marks the position of the end of the
liquid thread.
He then places the thermometer bulb in steam at 100°C and marks the position of the
end of the liquid thread.
(a) Explain why the student places the thermometer bulb in melting ice and in steam.
(1)
(b) Fig. 1.1 shows the thermometer next to a ruler.
Line A is the mark made when the thermometer bulb is in the ice.
Line B is the mark made when the thermometer bulb is in the steam.