Water Experiment: How Many Drops on a Penny?
Explore the science of water cohesion and adhesion with an engaging experiment! Participants guess how many drops of water can fit on a penny before and after cleaning with detergent. Discover how detergent affects water adhesion and learn about the properties of water. Have fun with this hands-on activity that combines physics and chemistry in a simple yet fascinating way.
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Presentation Transcript
Penny for your thougts This Photo by Unknown Author is licensed under CC BY-NC-ND
Overview How many drops can fit on a penny. During this activity, participants will guess how many drops will fit on top of penny. Next the pennies will be washed with detergent and tried again. Will a clean penny or dirty penny hold more water?
Materials Pennies Water Detergent Droppers
What to do Using the dropper, slowly drop the water on a penny, counting the drops, until the water runs off the side. Dry the penny and repeat with the next participant. Count how many drops each participant can get to fit on top of the penny. Observe what the water looks like before it runs of the side. Rinse the penny in the soapy water, how did it affect the amount of water the penny can hold
The science Water is cohesive, this means water sticks to itself. In other words water molecules are attracted to each other. Water is also adhesive with many other substances. This means water molecules are attracted to other surfaces like glass or a penny. Because of this stickiness, water molecules can pile up on top of a penny making the dome you observed. This is also why water can make a dome over a glass without spilling out
More science The detergent keeps the water from sticking to each the other and surfaces. That is why the soapy penny held less water also why detergents help clean things.
