The Volume of an object is the amount of space that it takes up. It can be measured in cubic millimeters, centimetres or metres.
Capacity is the amount that a container can hold. It can be measured using millilitres or litres.
I have a great understanding of what millilitres are. I am able to estimate the capacity of different containers.
I found out that the 250ml jug had to be refilled and emptied 16 times to fill the bucket so the bucket has a 4 litre capacity.
We used an A4 sheet of paper to make a tall cylinder and a short wide cylinder. We then filled both cylinders with centicubes. Although the main surface area of both cylinders was the same the capacity was quite different. I now understand that the surface area of a container may look the same but its capacity will be different.