Question

Give a reason for the following ;

A hollow aluminum can floats on water.

Answer 1

1. Density is a measure of how much mass is contained in a given amount of space (volume).
2. Aluminum in general has a higher density than water and it sinks in it.
3. But in the case of hollow aluminum, the density ( mass present per unit volume) is greatly decreased even below that of water since the majority of the object's volume is filled with air, so it floats.