The iron cube has a mass of 100 grams with a volume of 60 cm3. Is there a cavity inside the cube?

Initial data: m (weight of the iron cube) = 100 g; V (actual volume of the iron cube) = 60 cm ^ 3.

Reference data: ρ (density of iron) = 7.8 g / cm ^ 3.

To determine whether a hollow iron cube is or not, we calculate the net volume of iron in it:

V1 = m / ρ = 100 / 7.8 = 12.82 cm ^ 3.

Since the net volume of iron is less than the actual volume of the iron cube, the cube does have a cavity inside.