Answer: The vertical axis should labelled as 'Volume (unit)' as it is missing from the given graph.
Step-by-step explanation:
The labeling of vertical axis is missing from the given graph between the temperature and volume.
The vertical axis should labelled as 'Volume (unit)' because it is given that the graph is in between the temperature and the volume.And temperature is on the horizontal axis is already labeled in the graph.
On top of the graph name of the graph should also be written as Temperature vs Volume graph.
From the unit we mean that the unit in which is used in measuring the volume and in the graph like: L ,mL etc.