Early Atlas

Sink or Float Prediction Experiment

Children predict whether objects will sink or float, then test each one in water.

Ages 42–66 months

Inspired by HighScope Reggio Emilia Play-based learning prediction inquiry water testing

Materials

  • A clear tub or basin of water
  • A collection of safe objects such as a cork, spoon, sponge, coin, leaf, and toy
  • Two labeled trays or hoops marked sink and float
  • Towels for spills

Steps

  • Show the children one object and ask them to predict whether it will sink or float.
  • Have them place the object on the sink tray or the float tray as their guess.
  • Gently lower the object into the water and watch what happens.
  • Compare the result to the prediction and move the object if the guess was wrong.
  • Continue with each object, then look at the two trays and talk about what floated and why.

Variations

  • Test whether a ball of clay sinks but the same clay shaped like a boat floats.
  • Sort the objects by material first and predict by group.

Differentiation

  • For younger children, use a few obvious objects and focus on the prediction itself.
  • For older children, ask them to explain a reason for each prediction.

Accessibility

  • Offer picture cards of sink and float so children can predict by pointing.

Safety

  • Supervise closely at all times around water and keep small objects out of reach of mouthing.

Practices these skills

Evidence

Early Atlas