======Pouring Water Down a String======


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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:** Water String Trick, Cohesion and Adhesion Demonstration, Travelling Water
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====Summary====                   
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====Procedure====  
  - Cut a piece of cotton string or yarn about 60 cm long.  
  - Tape one end of the string to the inside bottom of a glass.  
  - Fill a measuring cup with water.  
  - Soak the free end of the string in the measuring cup for about 30 seconds until it is fully wet.  
  - Raise the measuring cup about 30 cm above the glass, holding the string taut but not pulling it free or letting it touch the side of the glass.  
  - Slowly pour water from the measuring cup so that it travels along the string into the glass.



====Links==== 
Traveling Water Experiment | Cohesion and Adhesion in Water Explained | Science Experiment for Kids - Hungry SciANNtist: 
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Pouring water down a string experiment - Phil McCordic: 
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📄 Pour Water Down a String! - Blue Marble: [[https://thinkbluemarble.com/learning-galaxy/activity-lab/pour-water-down-a-string/]]\\


====Variations====
  * Try using different types of string (cotton, nylon, wool) to see which works best.  
  * Test different string lengths to find the maximum distance water can travel.  
  * Change the angle of the string to compare how slope affects water flow.
  * Try using a stirring rod to pour from one beaker to another (this is actually a technique use in science laboratories).



====Safety Precautions====
  * Work on a waterproof surface or place a towel underneath to catch spills.  
  * Pour slowly to prevent splashing.




====Questions to Consider====
  * Would water flow down a dry string? (No, because adhesion requires the string to be wet first.)  
  * How does the angle of the string affect the water’s flow? (Steeper angles generally allow smoother flow.)  
  * What happens if the string touches the side of the glass? (The water may run down the glass instead of along the string.)  
  * What property of water makes it stick to itself? (Cohesion.)  
  * What property of water makes it stick to the string? (Adhesion.)