# A student has two blocks of the same material. Block A has a mass of 80 g and a volume of 40 cm³. Block B has a mass of 160 g and a volume of 80 cm³. The student claims that Block B has a greater density than Block A because it has a greater mass. Explain why the student is incorrect.

> Cambridge International IGCSE Physics (0625) — 1.4 Density · Explain · 4 marks

## Mark scheme (4 marks)

1. Density is mass per unit volume (not mass alone)
2. Correct density of Block A stated or clearly implied as 2 g/cm³
3. Correct density of Block B stated or clearly implied as 2 g/cm³
4. Both blocks have the same density, so the student is incorrect

## Key terms

- [density](https://www.gradenine.co.uk/glossary/density)
- [mass](https://www.gradenine.co.uk/glossary/mass)
- [volume](https://www.gradenine.co.uk/glossary/volume)

## Related

- [Revision notes for Cambridge International IGCSE Physics (0625)](https://www.gradenine.co.uk/learn)
- [How to answer "Explain" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
- [Practice this with AI marking (free)](https://www.gradenine.co.uk/start)

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