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Materials |
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- 2 plastic cups
- 2-3 feet long string - Scissors - water - Tape |
Procedure1. Cut the string 2-3 feet long.
2. Take a plastic cup and fill it with water. 3. Take the other cup and tape the end of the string to the bottom of the cup. 4. Take the cup with water and pour it into the cup with the string. 5. Place the cup with water diagonally over the empty cup. 6. Hold the other end of the string with your finger in the empty cup. 7. Now, begin pouring the water slowly. |
Scientific TheoryEach molecule of water is made up of two hydrogen atoms and one oxygen atom. All of the molecules inside water are held together by molecule bonds. The water pours down the string because of a process called cohesion. Since the string is already wet, it contains water molecules on its surface. The molecules from the water form a bond with the molecules on the string. This causes it to stick and travel down the string. Although, at first the molecules did not form a bond yet which, caused it to spill. This occurred because of a process known as adhesion. At first the adhesion was stronger than the cohesion.
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