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 containing a baseball has less room available for water than a glass containing a tiny paper clip, assuming the glasses and water levels are otherwise comparable.
So even though the four glasses may look equally full, their actual amounts of water can be different.
The Correct Answer Is Glass A
Glass A, the one containing the paper clip, contains the most water.
Why?
The paper clip is much smaller than the other objects. It occupies less space inside the glass and therefore displaces less water.
The baseball, eraser, and wristwatch all take up more space.
So, in simplified form:
Smaller object → less displacement → more room for water
That’s the trick.
Why Is This Puzzle So Easy to Get Wrong?
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