Why will a rolled - up ball of aluminum foil float in water but solid aluminum will float?
A) It won't - the ball will sink.
B) Due to the air inside, the average density of the ball is lower than water.
C) Aluminum is less dense than water anyway.
D) Water cannot get in to equalize the pressure.

Question

Quizplus · Accepted Answer

The rolled-up ball of aluminum foil floats because the air trapped inside lowers its average density compared to water, allowing it to float. Solid aluminum, being denser than water, would sink.

Why Will a Rolled - Up Ball of Aluminum Foil