Imagine two equal-sized boxes. If one has more mass, it has greater density. Now imagine two equal masses spread through different volumes: the smaller volume is denser. The calculation is mass divided by volume. Changing mass and volume together can leave the density unchanged when both change by the same factor. Water is the reference at about 1 gram per cubic centimetre. Under the model’s assumptions, density below that floats, density above that sinks, and equal density is neutral.
Matter and chemistry · Discover & try
Can a small object be denser than a big one?
Reading level 2 of 5 · DevelopingChange
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mass
A measure of the amount of matter in a sample.
volume
The space a sample occupies.
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Imagined uniform blocks with independently chosen mass and volume; no material identity is inferred.
What to look for
- Same volume can hold different masses
- Same mass can occupy different volumes
- Proportional changes preserve the ratio
Explain what you noticed
Sample A is 12 g in 4 cm³. Sample B is 24 g in 8 cm³. Which is denser?
Keep this idea: Compare mass per equal volume, not size or mass alone.
Follow the sources
- American Chemical Society — What is Density?
- American Chemical Society — Finding Volume by Water Displacement
Source material checked 2026-10-29. Explanations and activities by Nepedia. Source links do not imply endorsement.
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