(a)[1]
A test tube that is roughly half full of hot water is provided. State the extra apparatus needed.
(b)[2]
In the space below, sketch the apparatus and show where the eye should be when the readings are taken.
(c)[2]
Fig. 4.1 shows the top part of the table for the readings. Complete the table headings.
(d)[2]
Suggest two ways in which the apparatus could be set up so that the readings are accurate.