======Water Bottle Hole Prank======


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**Materials: **{{$demo.materials_description}}\\
**Difficulty: **{{$demo.difficulty_description}}\\
**Safety: **{{$demo.safety_description}}\\
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**Categories:** {{$demo.categories}}
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**Alternative titles:** Leaky Bottle Air Pressure Trick
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====Summary====                   
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====Procedure====  
  - Take an empty plastic bottle with a screw-on lid.  
  - With the lid tightly on, use a pin to make a line of small holes around the side of the bottle.  
  - Cover the holes with a strip of sticky tape.  
  - Remove the lid, fill the bottle to the top with water, and replace the lid securely.  
  - Gently peel off the sticky tape while keeping the lid on. Notice that water does not leak out.  
  - Hand the bottle to a friend and ask them to unscrew the lid. Watch as streams of water squirt out of the holes.



====Links==== 
Water Bottle With Holes Experiment - Playing With Rain: 
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Water Bottle Prank - Taras Kul: 
{{youtube>aENsO9o_cHw?}}\\

📄 DIY Science: Water Bottle Pinhole Prank - National Science Week: [[https://www.scienceweek.net.au/diy-science-water-bottle-pinhole-prank/]]\\


====Variations====
  * Try bottles of different shapes or sizes.  
  * Make fewer or more holes and compare the results.  
  * Test with warm water versus cold water to see if surface tension makes any difference.  
  * Perform the experiment outdoors with food coloring in the water for a dramatic effect.



====Safety Precautions====
  * Perform over a sink, outdoors, or in an easy-to-clean area to avoid spills.  
  * Use caution with pins—handle them safely and store them out of reach of children.  
  * Do not squeeze the bottle, as this may cause water to squirt unexpectedly.




====Questions to Consider====
  * Why doesn’t water leak out when the lid is on? (Air pressure outside the bottle pushes on the holes, balancing the force of gravity.)  
  * Why does the water squirt out once the lid is removed? (Air pressure enters from the top, allowing gravity to pull the water out through the holes.)  
  * How does this experiment demonstrate the role of atmospheric pressure? (It shows that air pressure is strong enough to hold water inside the bottle until a path for air is opened.)