Toss a brick

Question:

If you are on a boat and toss a brick overboard, will the water level rise or fall?

.

.

C

A

P

T

A

I

N

I

N

T

E

R

V

I

E

W

.

.

Solution: The brick in the boat displaces an amount of water equal to the mass of the brick. The brick in the water displaces an amount of water equal to the volume of the brick. Water is unable to support the level of salinity it would take to make it as dense as a brick—the brick will always sink—so the mass is definitely more than the volume. The brick displaces more water when it is in the boat than when it is in the water.

Answer: The water level drops.

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