Age: From 5 years old
Materials:
1. 1 zip-lock bag
2. a few pencils
3. 1 jug of water
4. 1 tray (optional)
Directions:
1. Pour water into the zip-lock bag.
2. Zip up the bag.
3. Pierce the bag with pencils in the places where it’s filled with water.
4. You will see that the water does not seep through and the water remains in the bag.
5. Explain the reason why according to http://brightside.me/article/six-simple-science-experiments-you-need-to-show-your-kids-14605/:
"Explanation: If you pierce the bag with the pencils and only then pour in the water, it will seep out through the holes you’ve made. But if you fill it first and then insert the pencils, the water will not seep out at all. This is a result of the fact that when the polyethylene is broken apart it’s molecules move closer together. In this case, the polyethylene tightens around the pencils."
1. Pour water into the zip-lock bag.
2. Zip up the bag.
3. Pierce the bag with pencils in the places where it’s filled with water.
4. You will see that the water does not seep through and the water remains in the bag.
4. Explain the reason why:
"Explanation: If you pierce the bag with the pencils and only then pour in the water, it will seep out through the holes you’ve made. But if you fill it first and then insert the pencils, the water will not seep out at all. This is a result of the fact that when the polyethylene is broken apart it’s molecules move closer together. In this case, the polyethylene tightens around the pencils."
References:
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