Try one of these simple experiments
1 Put a penny on a piece of paper. With a plastic dropper or a toothpick, place a single drop on the penny. Predict how many more drops will fit on the penny before the water spills off the penny onto the paper. Now add one drop at a time until the water overflows. How many drops did it take?
Variations of the experiment
- Wash the penny.
- Heat the penny.
- Cool the penny by placing it in the freezer for 10 minutes.
2 Pour enough water into a flat-bottomed bowl to cover the bottom. Fill a small jar with sand and place it in the bowl. Loosely cover the top of the bowl with plastic wrap. Secure with a rubber band. Place a small rock on top of the plastic directly over the jar. Place the bowl in direct sunlight or under a lamp. After one hour, observe the bowl and plastic wrap. What do you see? What are some possible explanations?
3 Fill a glass with ice and water, being very careful not to spill any water. Set the glass aside for 5 minutes. Observe the outside of the glass and the surface that it is sitting on. What do you see? What are some possible explanations?
4 Place a plastic bag over a limb on a tree. Make sure you are careful not to damage the leaves. Leave it there overnight. Check it the next day. What do you see? What are some possible explanations?