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What happens when you put drops of water on a penny?
The cohesion and surface tension of water becomes apparent when the drops of water you add to the penny reach the penny's edge. Once the water has reached the edge, you begin to see a bubble or dome of water forming on top of the penny.
Why did the penny hold so many drops of water?
The attraction of water molecules to other substances, like soil or glass, is called adhesion. As drops of water are added onto a penny, the adhesive force between the water and the penny keeps the water from falling off.
How many drops of water can a penny hold experiment?
Were you surprised to discover that a lot more drops of water fit on a penny than you predicted? We had 27 drops of water on ours! Surface tension and cohesion is the reason you can get so many drops of water on a penny. Cohesion is the \u201cstickiness\u201d of like molecules to one another.
Why does a penny hold more water?
Gravity flattens the droplets, cohesion holds the droplets together, and adhesion holds the drops on the surface of the coin. The cohesive force is the pull of the water molecules on themselves. Each successive drop sticks to the water that's already on the coin. We often call this cohesive force \u201csurface tension\u201d.
Why can a penny hold many drops of water?
The attraction of water molecules to other substances, like soil or glass, is called adhesion. As drops of water are added onto a penny, the adhesive force between the water and the penny keeps the water from falling off. Cohesive forces are strong, but not unbreakable.
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People also ask
Why does a penny hold more drops of water than alcohol?
The water is more attracted to itself than to the metal of the penny. The alcohol is a bit less attracted to itself so it spreads more on the penny.
How many drops of water can the penny hold independent variable?
It's just amazing to watch the drops of water pile up on the penny! We tried this several times, and we were able to get 23-27 drops on the penny each time before the water ran off the side. Then we compared the surface tension of plain water with soapy water.
Why does a penny hold more water than soapy water?
You should find that plain tap water produces a much larger, stable drop of water on top of the penny than the soapy water does. This is because plain tap water has higher surface tension, so the surface is \u201cstronger\u201d and can hold together a larger drop.
What was the control in the penny experiment What is the purpose of this control?
The control is the penny without soap. If a penny is covered with soap, then it will not hold as many water drops because the soap does not allow for adequate surface tension to occur.
What is happening that holds water on the penny and how soap and other surfactants change surface tension?
Soap works by disrupting the cohesive forces between molecules. When plain water is dropped on a penny, water molecules strongly attract one another and the resulting surface tension is high.
what was the control in the penny experiment what is the purpose of this control
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