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Difference between volume and capacity

Capacity is the total amount of liquid a container can hold. We can measure capacity in litres (l) and millilitres (ml).

Volume is the amount of liquid that is in a container. This changes when liquid is poured in or out.

1 litre = 1000 millilitres

1 l = 1000 ml

Volume and capacity are slightly different. Here’s an example:

• This jug has a capacity of 4 litres.

• The volume of liquid in the jug is 2 litres.

• The volume of liquid needed to fill the jug is 4 litres.

Can you see the difference?

The volume is how much liquid is in the jug.

Activity 1

Have a look around your house for a selection of different sized containers such as bottles, jugs and cups.

Measure how much liquid each container can hold.

• Which container has the largest/smallest capacity? How do you know?
• Can you order them from largest to smallest?
• Which container has the most or least liquid in?