Fluids · Physics

Density Simulation

Change a block's mass and volume and watch its density — and whether it floats. Then identify mystery blocks by measuring mass and the water they displace.

Interactive virtual lab · no download · works on phones and laptops

Chapter: Matter · Fluids
For: Class 8 · Class 9
Time: ~10 min

Density is a Pro simulation

Pro opens all 125 virtual labs — 483 simulations with guides and quizzes.

How to use it

1Intro: pick a material and change its mass or volume.
2Compare: four blocks with the same mass, volume or density.
3Mystery: weigh each block, sink it, read the volume, and match the table.

What to notice

Density = mass ÷ volume; it depends on the material, not the size of the piece.
Same mass, bigger volume → lower density.
The water level rise equals the volume of the submerged part.
Anything denser than 1 kg/L sinks in water.

For teachers

A ready-made teaching kit comes with this lab

Lesson plan
19 min, 4 steps
Ask the class
3 questions with answers
Quick quiz
6 questions, printable
Key formulas
1 formulas

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About the Density simulation

Density is how much mass is packed into each unit of volume. Two blocks of the same size can have very different masses, and two blocks of the same mass can have very different sizes; dividing one by the other gives a property of the material itself.

In this density simulation you weigh blocks on a scale, drop them in water to measure their volume from the rise in water level, and identify mystery materials from their density. It suits Class 8 and Class 9 science and the idea of floating and sinking.

Also covers: mass, volume, mystery block, displacement, float sink.