Kids Science Activities
The clinging water
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How to do it
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- Make three small holes in one of the sides near the bottom of the bottle about 1/2 cm away from each other. The holes should like on the same height.
- Fill the bottle full with water and ask the child to observe the water streams coming out of the holes.
- Bring the streams together with the fingers to make it one big stream. Seperate the streams by pushing one finger through the middle of the large stream.
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Explanation
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- The closer the holes are placed in the bottle, it is easier to get a whole stream out of it, but it is harder to seperate it into three seperate streams.
- The farther the holes are, the harder to bring the separate streams together.
- It is because of the cohesive forces between the water molecules that keep the streams together.
- The fuller the bottle, the larger the pressure and the easier to obtain seperate streams.
- With less water in the bottle, we will get lower water pressure and thus an easier cohesive whole stream.
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