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Year 7 Interactive Maths - Second Edition


Capacity

The capacity of a container is the volume of liquid that can fit inside the container.

For example, the capacity of a hot water tank is the volume of water that can fit inside the tank. The capacity of a petrol tank is the volume of petrol that can fit inside the tank.

The standard units often used for capacity are the litre (L) and the millilitre (mL).

1000 mL = 1 L

A container with an inner volume of 1 cm3 will hold 1 mL of liquid. That is:

1 mL = 1 cubic cm

We also use the units called kilolitre (kL) and even megalitre (ML).

1 kL = 1000 L, 1 ML = 1,000,000 L


Note:

1 L = 1000 cubic cm


Example 4

Express 3 L in mL.

Solution:

3 L = 3000 mL


Example 5

Express 4500 mL in L.

Solution:

4500 mL = 4.5 L


Example 6

Express 2.5 L in cm3.

Solution:

2.5 L = 2500 cubic cm


Example 7

Express 3.46 kL in L.

Solution:

3.46 kL = 3460 L


Example 8

Express 6890 L in kL.

Solution:

6890 L = 6.89 kL


Example 9

A diving pool contains 985 kilolitres of water. How many litres is this?

Solution:

985 kL = 985 000 L


Example 10

A reservoir can hold 25 450 megalitres of water. What is its capacity in litres?

Solution:

25 450 ML = 25 450 000 000 L


Example 11

Express 975 cm3 in litres.

Solution:

975 cubic cm = 0.975 L


Key Terms

capacity, container, liquid, litre, L, millilitre, mL, kilolitre, kL, megalitre, ML


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