- A glass
- Pins (different shapes & sizes)
WHAT TO DO
Fill up the glass of water right upto its brim. And then start dropping the pins into the water one by one.
You will see that the water does not spill out of the glass, even though it is filled right up to its brim.
WHY THIS HAPPENS
The surface tension of the water doesn’t allow the water to spill out and is the key reason for holding the water in the glass.
Now that you know how much external force the surface of a liquid can resist, try the same experiment with vegetable oil. Does oil have a greater surface tension or water?
For more such science experiments and articles, visit Science for Kids.