Leak Proof Bag Science Experiment for Kids

This leak proof bag science experiment is sure to WOW your kids! All you need is two household supplies and you can do this water experiment with your kids too.

This leak proof bag science experiment is sure to WOW your kids! Great for preschool, elementary and middle school!

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Lately, the kids and I have been doing lots of neat science experiments. They both love them and even ask if we can do another science experiment all the time. Some of our favorites have been this lava lamp experiment and this cloud in a jar experiment.

If your kids are into science experiments too, stay tuned to the blog because we have lots more planned. But for now, check out these super cool leak-proof bag experiment!

Leak Proof Bag Science Experiment

Water science experiment for kids.

To begin, fill a gallon size storage bag about half full with water. Then poke a pencil straight through the bag – in one side and out the other.

Science experiment for preschoolers.

Much to everyone’s surprise, the bag won’t leak! This is because the bag is made of a polymer – which is long, flexible chains of molecules. When you poke the pencil through the bag, the molecules spread apart and then seal themselves around the pencil. It’s really cool!

This water science experiment is super fun!

My kids would do this for a long time if we had enough pencils. They just think it’s so cool that they can poke the pencils through the bag and it won’t leak.

Water science experiment for kids. This leak proof bag is so neat!

If you are wondering what age this experiment is for, I will say that my 3.5 year old was able to do it no problem and as you can see she really enjoyed it. As always, supervision is required though.

Supplies Needed:

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  1. Fill a gallon size storage bag about half full with water.
  2. Poke a pencil straight through the bag – in one side and out the other.

That’s all! Do this over and over again for lots of amazement.

If you do this with your kids email and let me know. I bet they will love it!

Check out these other cool science experiments!

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Leak proof bag science experiment.