November 16, 2019

Leak-Proof Bag – Kid’s Science Experiment

Leak Proof Bag Experiment

Here’s an awesome and extremely easy Kid’s Science Experiment – the Leek-Proof Plastic Bag!!

I’m sure you have everything you need at home – 

  • Plastic Zip Lock Bags
  • Sharp Pencils
  • Water

Instructions – 

Simply fill and seal your plastic Zip lock bags with water and head outside or over a sink or bath (trust me when this experiment is complete the kids will want to see the bag get empty again lol). Have the children gently stab each pencil through the bag until it pierces both sides…and surprise, surprise, NO water leaks out!

Leak Proof Bag Kid's Science Experiment

This is such a neat activity! Our kids spent ages trying to see who could insert the highest number of pencils into the bag.

Leak Proof Bag Science for Kids

Then the inevitable happened…they wanted to pull them all out and watch the water filter out through all the holes!

Leaking Bag Experiment

We found this great idea on the Steve Spangler Science Website – he goes into great detail about how and why this works…I highly recommend checking his post here…you might also find some other cool experiments while you’re there :).

Louise x

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27 thoughts on “Leak-Proof Bag – Kid’s Science Experiment

  1. Hi I am home schooling my 10 yr old daughter this yr and I am having a hard time finding fun material for her. If anyone has any ideas for her grade leval I would be greatful. Thx!

  2. Okay, seriously, this could be used as a first aid lesson. The first thing you do with a puncture wound is LEAVE THE OBJECT IN. Why? Because you don’t know what it’s holding together inside. As long as the “pencil” is in the “bag” the bag is okay.

    This is genius.

    1. This is a demonstration, not an experiment. To be a science fair experiment, you would need to have a dependent and independent variable. For example, you could try putting the pencils into a bag of water that has some air in it and then putting pencils in a bag of water with no air in it to see if there is a different outcome.

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