Holey Leakproof Bag of Water!!!!!!!!!!!

Materials Needed:

• ziplock bag
• pencils
• pencil sharpener
• water
• food coloring

Step 1: Sharpen your pencils with a pencil sharpener. In order for this experiment to work, the pencil points need to be very sharp.






Step 2: Fill the ziplock bag halfway full of water.



Step 3: For contrast, add some drops of food coloring. Seal the bag.

Step 4: Take sharp pencils and poke them into the bag of water, using a circular motion. Do you see any leaks? NOPE!!!

Step 5: Slowly remove pencils and observe what happens. Now you have some leaks!

The Science behind the experiment:

Zip Lock bags are made from plastic. Plastic is made of polymers which are long chains of molecules cross linked together. Polymers are what makes plastic bags and balloons stretchy. When we poke through the zip lock bag with pencils the polymers are pushed aside but remain bonded by the cross-links - keeping the water inside. The polymers re-seal around the pencil. Amazing!