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Floating and sinking experiments are a fun way for preschoolers to be introduced to science. They are easy to set up and toddlers love seeing the results! In this floating and sinking grapes science experiment for preschoolers, your little one can even have snack while they observe. This is a fun one from our Summertime Fun Activity Plans!

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what you need for this science experiment for preschoolers:

  • Salt
  • Spoon
  • Grapes
  • 2 cups of water
cups, grapes, salt, and spoon for science experiment for preschoolers

How to do the science experiment for preschoolers:

Cup #1.

Have your preschooler drop a few grapes in one glass of water. Ask them if the grapes floated or if they sank. Let them drop in a few to watch how they sink all the way to the bottom.

You can talk about how different things float and sink while they are taking a bath and see if they remember what toys do which. Let them experiment a little until they are ready to go to the next step.

grapes sinking in cup for science experiment for preschoolers
salt in cup for science experiment for preschoolers

Cup #2.

Add several tablespoons of salt or sugar to the other cup of water and stir until it is completely dissolved. Drop 1 grape in. Does it sink or float?

If the grape still sinks, continue adding salt or sugar until the grape floats when it is dropped in.

This happens because the density of the water has now changed!

Finish and talk about the experiment.

After you have finished the experiment, talk about what your little one saw and what they noticed. You may be surprised by their scientific observations, but remember the point of science experiments with toddlers is to encourage creativity and experimentation, not learn science concepts! Let them experiment further by dropping in other items or adding more salt if they desire. Encourage their inquisitive thinking and you have accomplished the goal!

science experiment for preschoolers with salt, grapes, and cups of water

If you loved this science experiment for Preschoolers, check out our other science experiments for 3-4 year old’s!

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