Drops on Penny Experiment. Water vs Alcohol
Hydrogen bonds and surface tension give water some amazing properties. Let's use them to see how many drops of water fit on a penny.
There are two properties at work in this experiment: cohesion and surface tension. Cohesion is the attraction of like molecules to one another. In this case, the like molecules are the H20 molecules in the water drops. Surface tension is a special term we use to describe the cohesion between water molecules.
The water molecules have much more cohesion than alcohol molecules, because they grab onto one another through hydrogen bonds. Because a sphere allows for the maximum number of connections between water molecules, the expanding drop of water continues to maintain that shape.
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