The four glasses contain different objects:
- Glass A: A paper clip
- Glass B: A baseball
- Glass C: An eraser
- Glass D: A wristwatch
Because the water levels look similar, many people assume that all four glasses must contain approximately the same amount of water.
That’s where the puzzle becomes interesting.
The Key Is Water Displacement
The answer depends on a simple scientific principle: an object placed in water takes up space and displaces some of the water.
The larger the object, the more space it occupies.
That means a glass
