Sink or Float Predictions

Gather objects, predict whether each will sink or float, then test in a tub of water.

STEMEducational
AgeAges 2–8
Duration20 min
DifficultyEasy
CostFree
LocationBoth

Educational Value

Introduces density and buoyancy.

Materials Needed

Prep progress

Step-by-Step Instructions

  1. 1

    Show one object and ask: sink or float?

  2. 2

    Place it in the water and observe.

  3. 3

    Sort into two groups: sinkers and floaters.

  4. 4

    Discuss why some float and others sink.

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