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Surface Tension Experiment - Swimming Fish

 
The Swimming Fish
Materials you will need:

• Water
• A Bowl
• Liquid Dish Soap
• Cut out Fish (Cardboard)

3 fish images
 
Steps
 

1.  Fill the bowl with water.

2.  Place the cardboard fish on the surface of the water.

3.  Release a drop of washing-up liquid soap just behind the fish’s tail and watch the fish swim away.

Water molecules cling to each other so tightly they cause the surface of water to squeeze together and bulge upwards - like a bubble.

When the soap is put onto the water, this bond between the molecules breaks so the rest of the water pulls the water that is not bonded away - taking the cardboard fish with it !

 
 
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