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By: Paul Feisel and Sam Webb
We believe that the water doesn't leak from the holes because the air pushes the water back inside the bottle when the cap is screwed on.
Conclusion
Steps to The Leak-Proof Bottle
What causes the water to not leak out of the bottle with holes poked in it?
In conclusion, our hypothesis was partially wrong. It did involve air, but it wasn't involved in a way we thought. We learned that when there was no water in the bottle, it wasn't actually empty. Invisible air molecules rushed in the bottle from the top while the water was being poured into the bottle. The water doesn't leak from the bottle when the cap was screwed on because water molecules work together to make a skin to cover the holes called "Surface Tension". So if you want to prank one of your friends, we suggest using this experiment.
Materials: Two plastic soda bottles, Cap, Large nail, Large pan, Sharpie pen, Thumbtack
1. Use a nail to poke a hole near the bottom of the bottle.
2. Cover the hole with your finger while you fill the bottle all the way to the top.
3. Put the cap on.
4. Take your finger off the hole on the bottle.
5. Unscrew the cap.
6. Observe
Steps to the "DO NOT OPEN" bottle trick
Data
1.Start with a new plastic bottle.
2. Use a Sharpie to write "DO NOT OPEN" in fat letters on the bottom half of the bottle.
3.Carefully,use a sharp push pin(the thumbtack) to poke tiny holes through the bottle.
We tried both experiments with vinegar and salt water too. All three experiments recorded the same results even though they were different liquids.
4.Place the bottle in a deep sink or pan and fill it with water. This is the tricky part. Water will leak out of the holes while you're filling the bottle. Keep the water running as you screw the cap on. Don't squeeze the bottle or it will start leaking before you're ready.