Would you believe me if I told you that we can poke holes in a bag full of water without water leaking out? Probably not, but that’s exactly what happens in this fun science experiment! Read this article and do the fun piercing pencils through water bag science experiment. I have also enclosed a printable ‘experiment card” at the end of this post.
- Plastic Bag with zip-lock
- Sharpened Pencils
Step by step instructions to do the Pencils through water bag science experiment.
Read this article and do the fun piercing pencils through water bag science experiment
Fill the plastic bag with water
Fill a plastic baggie a little more than 1/2 way full of water.
Seal the Bag
Seal the baggie.
Stab the bag with pencil
Quickly stab a sharpened pencil through the baggie.
Try stabbing multiple pencils through the baggie. Why doesn’t the water leak?
Why Doesn’t the Water Leak?
The magic of this experiment lies in polymers. Polymers are long chains of molecules that make up many items we use in our everyday lives – specifically plastic items. Zipper top plastic baggies (like the one used in our experiment), plastic grocery bags, plastic water, and soda bottles, and plastic food packaging are all made of polymers. Products made of polymers are flexible, lightweight, leak-proof, and low in cost to produce.
Think of polymers as long chains of beads. When you stab a pencil through the bag, the polymers move apart. This is the same as if you stuck a pencil between two chains of beads. Because polymers are flexible, when you stab a pencil through the bag, the polymers push back toward the pencil and form a temporary seal. This prevents the water from leaking out of the holes. If you remove the pencils from the bag, the holes will remain in the bag because you have permanently pushed the polymers aside, allowing water to leak out.
- Plastic zip-bags
- Sharpened Pencils
- Fill a plastic baggie a little more than 1/2 way full of water.
- Seal the baggie.
- Quickly stab a sharpened pencil through the baggie.
- Try stabbing multiple pencils through the baggie. Why doesn’t the water leak?
Visit sciencetidings.com to learn more about this experiment and for more science experiments
If you like this experiment, you might also like to read the other cool experiments at sciencetidings.com
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