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Sponge Float Experiment
 
Floating Sponge
Materials you will need:

• Water
• Two Small Sponges
• Two Small Plastic Tubs

Does a sponge float or sink?

The answer - Both.

 

 
Steps
 

1.  Fill two small plastic containers with tap water.

2.  Take a dry sponge and place it on top of the water in one of your containers.

          

Does the sponge sink or float?

The longer you leave the sponge sitting in the water the heavier it gets and eventually starts to sink.

3.  Take the second sponge and submerge (dip) it all the way into the water with your hand and squeeze/pinch out all the air bubbles and let go of the sponge.

            

Does the sponge sink or float?

Be squeezing out all the air bubbles the sponge has less air pockets and therefore will sink to the bottom.

          

Photo above shows one sponge is floating and the other sponge has sunk.

As the sponge absorbs the water and has less air pockets, the heavier it becomes and therefore it will sink lower in the water instead of floating on top of the water.


 

 
 
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