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Volume: Comparing, adding and subtracting

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Tutor: Alice


Volume: Comparing, adding and subtracting

​​In a nutshell

Volume is how you describe how much space an object occupies, or the capacity of an object. As it measures the size of objects in 3 dimensions, you use the units cm3cm^{3}, mlml​ or ll​ to describe volume. You can use a submersion technique to find and compare volumes of objects.

Comparing volume

Bigger objects have greater volume, so a 100cm3100cm^{3} ball has a greater capacity than a 50cm350cm^{3} pencil case. Remember that you can only compare volumes if they have the same unit; a 750cm3750cm^{3} bottle is not bigger than a 1l1l​ water tank! Use this equation to convert between units:

1000cm3=1000ml=1l1000cm^{3} = 1000ml = 1l

Adding and subtracting volume


Make sure the units are the same.
Identify what the question is asking you:
  • "Find the combined volume of ..." means summing the volumes. 
  • "What is the difference in volume between ..." means subtracting one volume from the other.
Convert the answer back into appropriate units (if required).


What is the difference in volume between a 750cm3750cm^{3} juice bottle and a 1.5l1.5l​ water bottle?

1.5l=1500cm31.5l = 1500 cm^{3}​​

1500750=750cm31500- 750 =\underline{750cm^{3}}

What is the combined volume of the juice and water bottle in millilitres?

1.5l=1500cm31.5l = 1500cm^{3}

1500+750=2250ml1500 + 750 = \underline{2250ml}

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FAQs - Frequently Asked Questions

What is volume used for?

What are 3 possible units of volume?


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